Cherry Slimy Sawfly (Caliroa Cerasi), Pests Worldwide

Pests Worldwide

Pests and insects, how do you save yourself from their attack?

Cherry Slimy Sawfly (Caliroa Cerasi)

Pest Type: Fruit Pests

Row: Hymenoptera – Hymenoptera

Family: true sawflies – Tenthredinidae

It is found everywhere. It damages cherries, cherries, pears, hawthorn, less – plums, thorns, quinces, mountain ash, cotoneaster, apple, and ii.

The female is 5-6 mm long, the male is 4-5 mm, the body is black, shiny, legs are black, only brownish in the middle; wings are transparent, with a slightly darkened median band. The egg is 0.6 mm in size, oval, pale green. Larva – 9-11 mm, yellow-green, head small, brown or black; the front of the body (thoracic segments) is significantly expanded; legs – 10 pairs; the larva is covered with shiny black mucus and only at the last age loses it and becomes Bright. Pupa 6 mm long, yellow-white, in a dense oval earthen cocoon.

The eonimph larvae overwinter in an earthen cocoon in the soil at a depth of 6-15 cm. In the forest-steppe pupate in late May-early June, in the southern strip in the first half of May. A significant part of the larvae (sometimes up to 50%) remains in a state of diapause for repeated wintering. 7-10 days after the start of the pupation, a massive exit of imago from the soil is observed. On the second and third days after the departure, the females lay their eggs, placing them one at a time in the incisions made by the ovipositor in the incisions in the pulp of the sheet from the underside. The egg is clearly visible in the form of a brown tubercle. With mass reproduction of the pest on one sheet, there are 10-30 eggs laid by different females. It multiplies more often parthenogenetically. For 7-8 days of life, the female lays 50-75 eggs.

Embryonic development lasts 7-13 days. The mass revival of larvae occurs more often in the second half of June – early July. The larvae crawl onto the upper side of the leaf and become covered with mucus, which protects them from drying out. After 15-20 days, after 6-7 centuries, the larvae complete development and pass into the soil.

In Polesie and the northern zone, the Forest-Steppe develops in one generation, in the southern Forest-Steppe and the Steppe – in two. Years and laying of eggs of the second generation occur in the second half of August. The development of second-generation larvae often lasts until the end of September – beginning of October. Younger larvae gnaw out the flesh of the leaf in small spots, older ones skeletonize leaves, leaving only a network of veins. The second generation of the pest does more damage. The cherry mucous sawfly is a halophilic species, in connection with which it actively populates thinned stands, as well as slopes of the southern exposure. Severely damages the leaves on the south side of the crown of trees.

A significant role in reducing the number of the sawfly is played by lumps of parasites. So, the laid eggs actively infect the trichogram. The larvae infect a number of riders from the ichneumonids and eulophids and tahin flies.

Protective measures. Autumn plowing and spring loosening of soil in aisles and near-trunk circles. Loosening of the soil during the period of mass transition of larvae to pupation. When the pest colonizes more than 10-15% of the leaves – treatment with insecticides or biological products.

Cherry-Cherry slug (pear slug, cherry sawfly, pear sawfly)

Pest description and crop damage The adult is a glossy black wasp, about 0.2 inch long. The larva initially resembles a small slug, due to the olive green slime that covers the body and the fact that the head is wider than the rest of the body. Mature larvae are 0.37-inch long and orange-yellow. Larvae feed on the upper surface of leaves, skeletonizing them. Heavy feeding causes leaf drop with reduction in vigor and yield, particularly on young trees.

Biology and life history Cherry slug overwinters as a pupa in a cocoon 2 to 3 inches deep in the soil. Adults emerge over an extended period in late April to May. The adult female inserts eggs into leaf tissue, and eggs hatch in 10 to 15 days. Larvae immediately begin to feed on the upper surface of the leaf. After 3 to 4 weeks, they drop to the soil to pupate. Second generation adults emerge in July and larvae from this generation feed in August and September. Most larvae from this generation drop to the ground to overwinter.

Pest monitoring Watch trees for the slug-like larvae in August and September when large populations can build up.

Specific biocontrol agents are not known, but this is rarely a pest in backyard gardens, so significant biocontrol likely occurs most years.

Home orchardists: Individual larvae can be picked off, or they can be washed off with a strong stream of water.

Management-chemical control: HOME USE

  • carbaryl
  • esfenvalerate
  • insecticidal soap-Some formulations OMRI-listed for organic use.
  • kaolin clay (Surround at Home)-Repels some insect pests when applied as a spray to leaves, stems, and fruit. OMRI-listed for organic use.
  • pyrethrin-Some formulations are OMRI-listed for organic use.
  • spinosad-Some formulations are OMRI-listed for organic use.

Management-chemical control: COMMERCIAL USE

Spring and summer sprays

  • carbaryl (Carbaryl 4L) at 2 quarts/a. REI 12 hr. PHI 3 days. Extremely toxic to aquatic invertebrates; avoid spray drift and runoff to surface waters.
  • imidacloprid (Prey 1.6F, Nuprid 1.6F) at 6.0 to 8.0 fl oz/a. REI 12 hr. PHI 7 days.
  • spinosad (Entrust SC) at 4 to 8 oz/a. REI 4 hr. PHI 7 days. Results are best when applied at petal fall. OMRI-listed for organic use. May act slowly. Do not exceed 29 fl oz/a per year.

I’m sure I only checked yesterday, or maybe it was a few days ago; it’s easy to lose track at this time of year. Today I just checked again and seemingly out of nowhere they have appeared. Already there is a lot of damage and numerous little slimy black and brown slugs chewing though the leaves on my two year old cherry trees.

These pesky pests are of course pear and cherry slugs. They are the soft skinned larvae of a glossy black sawfly (Caliroa cerasi), and will quickly skeletonise cherry and pear leaves if left to their own devices. They also attack plums, apricots, hawthorn, apples and quinces, but are not as problematic on these trees.

Take control
You can treat initially by picking or squashing or hosing off. If there are too many, then dust with wood ash or chalk, flour or powdered clay (make sure you stand up-wind). All of these desiccate the skin surface so that the slugs shrivel and die. You can also use lime powder or lime dissolved in water. Alternatively spray with organic pyrethrum or neem. I manage to control them by squashing and hosing, and then I follow up by flinging wood ash over the leaves. I save the ash from our winter fires. Wood ash is also beneficial to soil as it adds potash that aids flowering and fruiting, but don’t use it too often. I will sometimes use lime, but I also don’t use this too often as it alters the pH of the soil, making it more alkaline.

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The life cycle
The adult sawfly lays eggs on the leaves which hatch out into the slugs in spring. The slugs feed on and skeletonise the leaves, resulting in a typical lacey look. Once the slugs reach full size they drop off the leaves onto the ground where they burrow down into the soil to pupate. The adults emerge, flying to the leaves to repeat the cycle. There are two generations each year. The first slugs pupate and turn into adults again in January so its really important to get the slugs under control in this first generation, as the second generation is much more numerous and can completely strip every leaf on a tree.

Some longer term control comes from predatory insects like hoverflies, paper wasps and lacewings, as well as spiders and insect eating birds like wrens. Plant flowers and flowering shrubs near your fruit trees to attract these useful predators into your garden.
The sense that pear and cherry slugs appear from nowhere originates from the larvae that overwinter in the soil. They hatch out and appear the following spring to start the annoying cycle all over again. Maybe next year I’ll catch them ealier.


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Pear and Cherry Slug

SERIES 30 | Episode 05

Pear and Cherry Slug is a common problem of many fruit trees including cherries, quinces, hawthorns, plums, medlars and pears. Appearing throughout the warmer months of the year, Pear and Cherry Slug are the larvae of a Sawfly, who chooses the foliage of the target trees to lay eggs. Once these eggs hatch, the slimy, glossy black larvae are visible on the leaves, and their damage can be significant – foliage can be skeletonised very quickly by these voracious pests.

Pear and Cherry Slug can persist at a site for multiple lifecycles, as the larvae will drop to the soil and pupate, re-emerging as adult Sawflies, and the process starts over again. If left unchecked, Pear and Cherry Slug can significantly impact the health, yield and vigour of the target tree, and in severe infestations, may result in the death of the plant.

Tino recommends a few different treatment options to get rid of these slimy nightmares:

Option 1

Squish the larvae with your fingers and leave in place

— This will need to be repeated a couple of times over the season

Option 2

Throw either garden lime or wood ash over the foliage — this will dry out and kill the Pear and Cherry Slug

— This will need to be repeated a couple of times over the season

— Has the added bonus of sweetening an acidic soil

Option 3

Spray the foliage with a dilute dishwashing liquid solution

— This will need to be repeated a couple of times over the season

Option 4

Increase the biodiversity in your patch which will encourage beneficial insects and natural predators of the pear and Cherry Slug

— Allow ducks and chickens into the patch to pick out and devour any larvae pupating underground

The most dangerous pests of cherries and effective control of them.

Every gardener who grows fruit and fruit trees knows that it’s not easy to grow healthy sweet cherries on your plot. There are many varieties of sweet cherries, but all of them are prone to diseases, as well as to damage by pests that must be constantly fought.

Sweet pests affect the tree completely: from the root system to the fruit. Loss of garden yield due to pests, on average, reaches 30%, and during insect breeding — 70%. Productivity and getting a good harvest is impossible without protecting trees from harmful insects and organisms.

There are several reasons why cherries are so susceptible to diseases and pest attacks. The most common — these are improper planting and care, inappropriate weather conditions, and infection transmission from neighboring fruit trees.

Cherry variety also plays an important role in the viability of the tree. When purchasing seedlings, pay attention to varieties resistant to pests adapted to your conditions, bred by breeders.

In any case, whichever variety you choose, it is very important to be able to identify specific pests in a timely manner and to know how and better than to treat cherries for effective control of them.


Large white butterfly with dark veins on wings — haws, by itself does not harm the garden. However, one individual of such a butterfly can lay up to 500 yellow or orange eggs, which after a couple of weeks will turn into gray-brown or yellow-brown caterpillars.

These are the main pests of the cherry orchard, they devour the leaves of the cherry and other fruit trees, shrubs. Closer to winter, the larvae of the hawthorn are woven into cocoons and remain to hibernate in the leaves.

To avoid unwanted crop loss, start spraying cherries from pests in spring, in late March — early April. To destroy all the surviving cocoons, spray the tree and the soil around urea solution. You will need 700 g of urea per 10 liters of water.

Also, to combat the hawthorn, it is necessary to collect its nests and equip the titmouse in the gardens, since only the tits eat these caterpillars.

Important! Urea treatment should be carried out in a strictly specified period: end of March — beginning of April. You can not later — you can burn the kidneys and ovaries.

Cherry weevil

The widespread cause of the death of a tree is cherry weevil on sweet cherry Also called cherry pipe-pipe, which devours buds, foliage, buds, and uses fruit for laying eggs.

To effectively fight with it, you need to clean the trunks and branches of the old bark from autumn, to clean the cleaned parts of the tree with lime, and to burn the bark waste and fallen leaves.

The main place for wintering of most pests, including weevils, is basal soil, which must be dug up. During the swelling of the buds in spring, most of the weevils can be shaken off on a sheet spread under a tree.

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For spraying well established drugs «Karbofos», «Rovikurt», «Inta-Vir», the dosage for an adult tree is about 3-4 liters.

In addition to drugs, there are popular folk remedies to combat weevil, for example, spraying infusion of chamomile ordinary. Take about 200 flowers, fill with 15 liters of water and let stand for a day. Then strain and add to it about 60 g of soap.


Zlatoguzka (golden silkworm, zolotuchka)white butterfly volnyanka with golden fluffy abdomen. The pest of fruit trees at the caterpillar stage, infects the leaves until the branches are completely exposed.

The caterpillars of the gold-wrecker eat the leaves up to the veins and attach them to the branches with a thick layer of cobwebs, forming a nest in which they hibernate. As soon as the buds begin to bloom, the caterpillars emerge from the nests and devour the leaves. During the season, this pest can destroy up to 25% of healthy leaves.

There are mechanical methods for the destruction of gold and gold and chemical. First consist in removing and destroying wintering nests from trees. The use of light traps and pheromone traps is also effective.

Among chemical methods, the most effective is spraying before flowering insecticides «Karbofos» (10%), «Benzophosphate» (10%) or «Antiline» (5 liters of water 25 g), Lepodotsid (20-30 g per 5 liters of water). Before blooming buds, cherries can be sprayed with Nitrafen and Olekupri.

Important! Touching the caterpillar can cause a rash on the hands, skin scarring and asphyxiation. When machining trees, use pruners and wear gloves.

Winter moth

Mothsfamily of moths, numbering more than 50 species. Of these, the winter moth is the most dangerous for the sweet cherry.

This pest infects trees in the fall, in late September — early October. Strengthens the leaves with cobwebs and lays eggs there, subsequently these leaves eat the caterpillars. Also caterpillars feed on buds, young leaves, flower buds.

To combat peppered moth need early fall tillage the soil between rows and dig around near-trunk circles, which reduces the number of pupae. Of the chemical agents, 10% «Benzophosphate» (60 g per 10 l of water), 10% «Karbofos» (80-90 g per 10 l of water), 80% «Chlorophos» (20-30 g per 10 liters of water).

It is necessary to spray before the buds are tied. Such insecticides also give a good effect — «Zolon», «Nexion».

Ringed silkworm

Ringed silkwormit is a moth, beige with a dark stripe on the front wings. Caterpillars of the silkworm about 6 cm, dark gray, covered with dark hair, damage the leaves of cherry and many other fruit trees. Easily carried by the wind.

Ovipositions are formed on thin branches of a tree in the form of ringing ringlets, caterpillars hibernate in these masses. Before flowering out of eggs and devour young leaves and buds. They cause irreparable harm to cherries, because of which it cannot bloom and bear fruit for several seasons in a row.

To combat ringed silkworm you need to regularly inspect the tree and, if you find egg-laying, scrape them off and burn them. Also from the branches you need to remove the entire web, which could remain pests. This should be done in overcast weather, then the caterpillars will not crawl out of the nest.

In the spring, before flowering, sprayed with such insecticides, such as «Zolon», «Karbofos», «Metiation», «Metaphos», «Nexion», «Phosphamide», «Chlorophos», etc. «Nitrafen» and «Oleco-spur» will be suitable before bud break.

Fruit mites

Brown or red fruit mite damages trees of all fruit trees, sucking sap from leaves and buds. The pest overwinters on the shoots and branches.

The larvae appear from eggs in spring, damage the buds of trees, then feed on sap from the leaves. Damaged leaves become a dirty white color, stop growing and developing. At the same time, branches stop growing, yield decreases, and the frost resistance of the tree decreases.

Methods of struggle: in the fall or spring, before bud break, the plants are treated with a 1-1.5% solution of the drug DNOC (dinosal). After budding, before flowering and after, as well as in summer, trees are sprayed with Metaphos (0.3%) or Phosphamide (0.2%) emulsion.


May beetles actively breed at the end of spring. Females lay eggs in the ground, near the roots of cherry. Eggs turn into larvae that live in the soil for about 3-4 years, all the while feeding on the roots of the tree.

There are several ways to combat this pest, the most laborious and least effective — mechanical collection of larvae. The safest and most effective method is land plot sulking.

The larvae do not tolerate nitrogen, so white clover is planted to control them near the cherries. Bacteria at its rhizome process nitrogen from the air and spread it to the roots of neighboring plants.

Chemicalsspraying with drugs «Aktophyt», «Bowerin», «Fitoverm».

It is also possible to minimize the harm from the larvae of the May Beetle using onion decoction for watering the soil near the cherry tree. Two thirds of the water you need to take a third of the onion peel and insist 7 days. The resulting solution must be diluted with water 1: 1 and water the base of the tree in the evenings.

Cherry slimy sawfly

Adult individual of the black sawfly black color, wings transparent, body length 4-6 mm. Damages cherry, sweet cherry, plum and other fruit plants. Its caterpillars eat leaves to veins. During the autumn digging of the soil of the near-trunk circles, the larva larvae who have passed for wintering are partially destroyed.

Mass emergence of larvae is observed after harvest, then you can apply spraying trees 10% Karbofos (75 g), 25% Rovikurt (10 g), Chlorophos (15-20 g per 10 liters of water). After harvesting, you can spray the broths of insecticidal plants — chamomile, henbane black.

Cherry shoots moth

The most dangerous pest of sweet cherry is cherry moth. It is a tawny insect with white spots and a dark transverse band. Caterpillars gnaw growing buds and flower buds, then damage young leaves. After these pests on the shoots remain lumps, like pieces of wool, with black spots — excrement.

As a counter to the cherry moth in the middle of June, it is necessary to dig in near-trunk circles and carry out spraying 10% Karbofos (75 g) and 10% Trichlormetaphos-3 (50-100 g per 10 liters of water). Treated during bud break or bud formation. Preparations «Spark» (in mid-spring), «Kinmiks» (after flowering), 1 tablet per bucket of water.

Another option — pour boiling water over 2 cups of wood ash in a three-liter jar and insist day. Add soap shavings. Pour into a 10-liter bucket, mix, strain and add 40 ml of table vinegar. Immediately spray.

Fruit Moth

Small butterfly, the caterpillars of which destroy the leaves, leaving only the bare branches of the tree. Before flowering, the caterpillars of the fruit moth are transferred to the surface of the leaves and feed on the outside, weaving around the food sites of the web into spiderwebs. Sometimes this pest can destroy almost the entire foliage of trees.

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After pupation, butterflies make egg-laying on the bark of the tree. Destruction methods fruit moths are digging near-stem circles and burning opal foliage. Chemicals — 10% Karbofos (75 g) and 10% Trichlormetaphos-3 (50-100 g per 10 liters of water).

Did you know? The larva of the cherry moth, which can be found in the berry, is absolutely not dangerous for humans. Moreover, the presence of this pest says that the cherry trees are not sprayed with insecticide.

Cherry fly

One of the most dangerous pests of cherries and cherries. Cherry fly on sweet cherry destroys up to 90% of fruits, and about 30% on cherries.

Pupae overwinter in the soil at a depth of 2 to 5 cm. In May, after flowering, adult flies are born, 6 mm in size, black and brown in color on the wings. Eat pests juice unripe fruit. Cherry fly eggs lay near the stem, damaging medium and late varieties.

Early varieties ripen before the flies come out and remain unharmed. From eggs in the fruit develops a larva that feeds on pulp. The spoiled fruits darken, rot, separate from the stalk and fall off.

To eliminate the cherry fly, it is necessary to carry out deep plowing in the fall. Also needed spray trees 2 weeks after the start of departure and again 2 weeks after the first spraying.

Approaches: 50% «Karbofos» (1-3 kg / ha), 20% «Metaphos» (1.5-3 kg / ha), 80% «Chlorophos» (1.6-4, 5 kg / ha), preparations «Iskra», «Lightning» twice a season. The first time is at the end of April, the second — in 18-20 days. Then once a week you need to spray the soil around the tree with the same preparations.

Cherry Aphid

Cherry Aphid (Black Aphid)serious pest for sweet cherries in the phase of the bud. A black-brown female 2-2.5 mm long lays eggs at the base of the kidneys, after which the larvae that eat the sap of the leaves emerge from them. After injuries, the leaves stop growing, curl, blacken and dry.

In case of mass flowering, black aphid breeding occurs, as a result of which it passes to the fruits and stalks and contaminates them with sticky excrement and larval skins.

There are several tips on how to deal with black aphids on sweet cherries. Mechanical way is to remove the places of active settlement of cherry aphid — basal vegetation and shoots.

When mass reproduction is necessary in early spring, before the appearance of the kidneys, to spraying drugs «Aktelik», «Inta-vir», «Commander», «Fitoverm».

There are and popular sprinkling recipeswhich have proven their effectiveness: solution from household soap (half a piece of soap for 10 liters of water); another solution is insist the ash solution for three days (0.5 kg of ash per 5 liters of water). This method will not only help get rid of black aphids, but also serve as foliar feeding.

Important! When using any chemical agents, strictly follow the recommendations of the manufacturer and do not exceed the dosage!


Protection from birds in the cherry is extremely necessary, despite the fact that often they are also assistants in the garden, eating many pests: caterpillars, beetles and larvae.

Did you know? People refer to cherries as «bird cherries» because some birds love to peck at them.

There are several effective methods that protect the crop from sparrows, starlings, thrushes and jays that harm the sweet cherry, pecking fruit to the bone. Of course, we are not talking about chemical methods, but only about mechanical ones, such as ultrasonic repellents, gas guns, nets, scarecrows, and others.

Ultrasonic Repeller — a rather expensive tool that pays off if you grow a lot of fruit trees. The range of this device is about 90 square meters. m, while it is completely safe for humans.

Generating flashes of bright light or an alarm signal that birds emit when danger, this device provides reliable protection of the crop against feathered pests.

If there are not so many trees on your plot, you can use gas gun. This is a tank that is filled with propane and automatically shoots without human intervention. It simulates the sound of a shotgun rifle, such a cylinder is enough for 5000 shots.

There are still special bird netsA small fishing net will also fit. In European countries, for example, gardeners are saving themselves from birds — they just throw nets on trees. However, this method is valid only for low, young trees.

You can also refer to the classic ancient methods, such as scarecrows and tinsel. As a tinsel, you can use light shiny and rustling objects — New Year’s «rain», old CDs, colored cellophane, foil.

Experienced gardeners are advised to use blue objects for this, as birds are inexplicably afraid of this particular color.

There is also an option like sweet cherry fruit processing with hot pepper solution. You need to take 10 pepper pods, soak them for 3 days in a large can of water and spray the top of the tree. Before use, the fruit sprayed with this solution just needs to be rinsed well with water.

Pest preventive measures

As you know, any disease is easier to prevent than to cure, so do not forget about the prevention of trees and the observance of agrotechnical measures for the care of cherries.

First of all, in the arrangement of the garden, choose the right place bookmarks. This should be a well-drained soil of suitable composition, in places far from wild plants.

When pruning branches affected by pests, always grab 10-15 cm of a healthy area., there may also be hiding larvae or spores.

Required timely collect and burn infected leaves, branches, shoots and fruits. It is necessary to burn all this far from a private garden site.

After harvesting in the fall, all fallen leaves must also be harvested and burned, since they usually overwinter the eggs of pests. Twice a year in spring and autumn you need to dig the soil around the tree and update the whitewashing of the trunk and large branches.

Despite the «tenderness» of the sweet cherry, you should not abandon the idea of ​​planting this tasty berry on your plot. Knowing what birds and pests eat sweet cherries, as well as timely performing simple methods of dealing with them, you will be able to grow a bountiful harvest for many years.

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