Control Grasshopper Garden Damage

Control Grasshopper Garden Damage

Grasshoppers cause damage to gardens across the U.S. With about 600 different species in the U.S., grasshoppers are common across the country. About 30 of these species are considered to be garden pests and damaging to plants. Thus, the purpose of this article is to answer the often-asked question: How to kill grasshoppers by natural and organic means or with chemicals?

But just a quick note before we talk about grasshopper control—these insects also can benefit the environment because their excrement provides nutrients to fertilize plants. The grasshoppers themselves are also food for birds, lizards, spiders, and other arthropods and insects.

Damage from Grasshoppers

But grasshoppers also cause damage. Because they are herbivores, they feed on grasses and the leaves and stems of plants; so when large numbers of certain grasshopper species infest farms or garden areas, they can cause extensive plant damage and loss. In fact, in peak years, grasshopper infestations have been known to destroy or consume entire crop fields.

Although grasshoppers will feed on many different plants, they often prefer—and cause the most damage to—small grains, corn, alfalfa, soybeans, cotton, rice, clover, grasses, and tobacco. They may also eat lettuce, carrots, beans, sweet corn, and onions. Grasshoppers are less likely to feed on plants such as squash, peas, and tomatoes leaves. The more grasshoppers there are in any one place. However, the more likely they are to feed on a variety of plants besides the ones they most prefer.

Grasshoppers are most likely to cause damage in sub-humid, semi-arid areas in the middle of the U.S.—from Montana and Minnesota to New Mexico and Texas.

Grasshopper Identification

Adult grasshoppers are reddish brown to olive green, depending on species. They may be as long as 1-3/4 inches, with narrow bodies. These grasshoppers have distinctively long, angled back legs, enabling them to be strong jumpers. They have protruding heads dominated by large eyes and chewing mouthparts. Adult grasshoppers have wings and can fly.

Young grasshoppers are smaller than adults and are wingless. When first hatched, these nymphs will be white. As they grow, they will take on the color of the adults of their species, and wings begin to appear as small pads. Grasshoppers will start being seen in early spring, with the greatest numbers generally occurring in mid-summer. Also, grasshoppers populations are likely to be highest when the weather is hot and dry.

Natural and Organic Control of Grasshoppers

Because grasshoppers are very mobile, they are also very difficult to control. The best way to control grasshopper damage is to prevent the growth of populations:

  • Till the ground in mid- to late summer to eliminate areas in which females would lay their eggs—which overwinter in the soil and hatch in the spring.
  • Till the ground in late fall and early spring to destroy eggs that were laid the previous summer.
  • Get rid of weeds even in areas that don’t have plants to reduce the availability of food for newly hatched nymphs.
  • For natural animal control, encourage grasshopper predators such as birds in and around garden areas.
  • Cover grasshopper-preferred plants with cheesecloth to protect them.

Chemical Control of Grasshoppers

When necessary, chemical bait and spray pesticides that are labeled for grasshopper control can also be used, reading and following all label directions. According to Colorado State University Extension, however, baits and sprays need to be applied to developing stages of grasshoppers and concentrated at sites where egg laying occurs, as the ability to control grasshoppers declines as they develop and migrate.

So when these treatments are used to kill grasshoppers, they should be focused on young grasshoppers and breeding sites during spring and early summer, depending on the geographic area.

The university also notes that adding canola oil to an insecticide spray can improve control by making the treated plants more attractive to the grasshoppers.

www.thespruce.com

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How to Get R > Published August 25, 2016 and updated March 2, 2019

There’s nothing worse…

You’ve cultivated an amazing garden, full of lush greens and veggies, only to have it relentlessly attacked by grasshoppers. Unlike many garden pests, which focus on one type of plant, grasshoppers aren’t too picky and can obliterate most of the plants you’ve spent all season growing.

In this guide, you’ll learn ​many different ways to prevent, control, and kill grasshoppers, even if they’ve already infested your garden.

Best Organic Grasshopper Control Products​

Overview of the Grasshopper

Grasshoppers can decimate your garden. They eat around 50% of their weight every single day. No matter where they are in their life cycle, they’ll chew away at both the stems and leaves of plants in your garden. If left unchecked, this damage can become severe, leaving your entire garden without leaves, unable to grow.

Adults (1-2 inch long) are brown to reddish yellow or green in color with prominent jaws, fully developed wings, and short antennae. They have enlarged hind legs and can jump great distances. Immature stages, or nymphs, are similar in appearance to adults, but are smaller and have wing buds instead of wings.

Note: Ten adults per square yard are economically damaging to rangeland, according to the USDA. Smaller numbers can damage cropland or gardens, depending on crop type and age. A classic study showed that 6-7 adults per square yard on 10 acres of pasture ate as much as a cow.​

Life Cycle of Grasshoppers

Not all grasshopper species are bad for your garden, but the ones that are all have a similar developmental cycle. Learning how their life cycle works is step one to killing grasshoppers before they can destroy your garden.

Grasshoppers lay their eggs at the end of the summer, buried in the soil in pods. These eggs lay in the soil through the winter, going into diapause, and hatch in early spring.

As soon as they hatch, grasshopper nymphs immediately start to consume plant matter in the area where they hatch. As they grow, they begin to exhaust the food supply and start to move to new areas.

It takes about 1.5-2 months for grasshoppers to reach adult stage. But once they do, they just continue to munch on the plants in your garden until they’re killed by winter.​

Common Habitats for Grasshoppers

Grasshoppers are found all around the world — in fact, the only continent that isn’t plagued by them is Antarctica. While you can find them in many different types of landscapes, they prefer warm, dry climates and areas with low-lying grasses and plants. This means you’re likely to find them in fields, deserts, meadows, grasslands, and mountains. And your garden, of course.

What Do Grasshoppers Eat?

Grasshoppers eat plants, but most specialize on grasses or broadleaf plants. Pest species, on the other hand, feed on a wide variety of plants and will readily switch from grasses to broadleaves. As nymphs, grasshoppers tend to congregate and remain near their hatching areas. They will remain there as long as there is an adequate supply of food and shelter.When food runs out they will move. Immature grasshoppers can’t move very far, because they don’t have wings, but winged adults can fly for miles in search of new food sources​

Hungry grasshoppers like gardens because they have optimal moisture and excellent plant growing conditions. That gives them an abundant food supply that they don’t have to spend much energy to get to.

How to Get Rid of Grasshoppers

While there are many different methods to get rid of grasshoppers, they can all be grouped into three different categories:

  • Environmental​
  • Organic Applications
  • Animal Control

It might be tempting to just pick one method out of the list you’ll find below, but you will have better results by mixing a few different methods to form an integrated approach to grasshopper control.

This way, if one method isn’t 100% effective, the other techniques can pick up the rest.

Let’s get into it!

Environmental Grasshopper Control

The first line of defense against grasshoppers is to either create an unattractive garden environment for them, or to create an attractive environment away from your garden.

Flowers to Plant

One of the first things you can do is plant flowers that grasshoppers do not like. Mixing these into your garden layout will keep grasshoppers away from plants that you don’t want them to munch on:

  • Dianthus
  • Lilac
  • Forsythia
  • Crepe myrtle
  • Moss rose
  • Verbena
  • Salvia
  • Sage
  • Lantana
  • Juniper
  • Artemisia
  • Jasmine

Vegetables​ to Grow

Even better, try planting veggies that grasshoppers don’t like to eat! There are a few that I have used in my garden and they have worked very well: squash, tomatoes, and peas.​

Thankfully, these aren’t ‘weird’ veggies that I don’t have a use for besides repelling grasshoppers. I eat squash, peas, and tomatoes ALL of the time, so planting even more to repel those pesky bugs isn’t a burden on my garden!

Add Tall Grass to the Outskirts of Your Land

If given the choice, grasshoppers prefer to feast and hide in tall grass. If you have the space, add grass around your garden as the summer draws to a close. You can use it as a hedge against any grasshoppers, providing them a better habitat than your precious garden.

As long as you are weeding your garden effectively, the grasshoppers should settle in the grass and not your garden.

Use Floating Row Covers

  • TWO ways to use – for seed germination and frost protection
  • Traps heat and moisture to speed seed germination and plant.
  • Traps heat to insulate plants from harsh frost and wind
  • Reusable season after season
  • Easy to use – “floats” over crops without support

If you don’t have grasshoppers in your garden and want it to stay that way, using a floating row cover or a fabric barrier is a great way to protect your plants. The fabric should be held up with hoops, although stakes will work decently.

Whatever you do, make sure that plants are not touching your floating row cover, because grasshoppers can still attack them from the outside of the fabric.

Harvest-Guard has 5×50′ and a 5×25′ row cover fabric that is well-reviewed and will get the job done if you decide to use this technique.

Rototill in Spring

You can take advantage of the grasshopper’s life cycle by roto-tilling your land in early spring. We know that they lay eggs in late summer, the eggs are dormant over winter, and hatch in spring. This means that an early spring rototill can destroy the egg pods and disrupt the life cycle of this pesky green hopper.

Organic Grasshopper Control

If you want to add another grasshopper prevention tool to your garden, consider organic grasshopper sprays and baits. Some of the following can be homemade and others must be purchased from your garden store or online.

Garlic Spray

​Garlic spray has been shown to deal with grasshoppers pretty well. They really don’t like the smell or taste of garlic, so coating your plants in garlic spray is a great way to prevent them from a grasshopper’s hungry appetite.

Use a highly concentrated version so you can dilute it and spray it over a large area with a pressurized spray bottle. While you can make your own garlic spray​, there are fantastic commercial garlic sprays available on Amazon that I use in my own garden instead of making it myself.

Hot Pepper Wax

  • Finally there is a natural insecticide that really works on.
  • Repels up to three weeks
  • Normal rains or irrigation cannot wash it off
  • Protects against insects including aphids, whiteflies.

​Hot pepper wax spray is another application that works by being a disgusting flavor for soft-bodied insects like grasshoppers. They just can’t stand the taste of the cayenne pepper, which is the main ingredient in this concentrated spray. Applying it to the leaves of your garden, especially on the plants more prone to grasshopper attack, should go a long way to repelling grasshoppers.

Neem Oil

Neem oil is a popular organic application that’s used as a fungicide as well as a pesticide. Some gardeners have success with neem oil for grasshopper control, while others report that they prefer using other methods. Either way, it has been shown to both repel grasshoppers and inhibit their egg-laying process. That disrupts their life-cycle and ideally means you won’t have to deal with them in the coming spring.

Neem oil from the Neem tree in Australia can be used as a repellent. It works in several different ways. It is a repellent, a feeding inhibitor, deters egg-laying, and retards growth.​

Nolo Bait

  • Safe to use around humans, plants, and animals
  • Most effective grasshopper/cricket bait
  • %100 Organic
  • Fast results

Nolo bait is a product that takes advantage of a disease that affects most species of grasshoppers, Nosema Locustae. This is a single-cell organism that will infect and destroy grasshoppers in every stage of their developmental cycle. While they do affect some other types of crickets, the cross-species damage is low.

When using nolo bait, you have to time your application correctly. If you don’t get to the grasshoppers after they have hatched and are nymphs, the effectiveness of the treatment will be diminished.

When they are about 0.25″ long, apply the nolo bait. Grasshoppers that consume this will have their blood poisoned, causing death. Here’s where it gets interesting: the remaining grasshoppers will eat the dead ones, causing them to be infected as well​.

This infection mechanism means that nolo bait can attack grasshopper infestations over the course of multiple life cycles, because all it takes is 1 infected hopper to keep the disease spreading.​ Use it over large areas to be sure that you are infecting enough grasshoppers for the disease to wipe them out completely.

Kaolin Clay

  • Useful on normal, dry and sensitive skin
  • Common Uses: Soap. Face & Body Masks. Bath Fizzies.
  • Cosmetic Grade.
  • Country of Origin: United States

Kaolin clay is a newer type of grasshopper prevention that may be useful to you. It’s a powdered clay that is mixed with water and soap and then sprayed onto the leaf surfaces in your garden. This causes a film to coat the leaf surface, repelling grasshoppers.

Many people find kaolin clay to be unsavory because it makes their garden look uglier, but some people love the prevention measures. Another thing to consider is that you’ll have to wash your greens and harvests more thoroughly if you are using kaolin clay because it is a leaf coating.

​Diatomaceous Spray

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Diatomaceous earth is a popular garden additive for many different reasons, but most notably because of how it affects pests that you don’t want in the garden. It’s made up of the shells of fossilized algae. When it comes in contact with a soft-bodied insect like a grasshopper, it effectively dehydrates their body, causing them to die.

If you are going to use this product, be sure to have eye and mouth protection as you don’t want to inhale this or get it in your eyes at all. You can either dust it on crops or in grasshopper-infested areas, or mix it with water and use a sprayer to apply it. It will become effective again once the water evaporates, leaving a film of diatomaceous earth on your plants.​

Pesticidal Soaps​

You can purchase organic pesticidal soaps that can destroy grasshoppers with ease. They contain fatty acids that dissolve the body of the grasshopper immediately upon contact. This causes them to lose water, dehydrating them. Death follows shortly. You must be careful when using these products though and make sure that they won’t have the same effect on your plants! The last thing you want to do is spray for grasshopper control and end up killing your plants as well.

Flour Dust​

Some gardeners have gone truly home-made and reported that applying flour dust to their garden has an effect on grasshopper populations, though this is the least well researched option of every one I have listed so far. If you have any experience with this technique, please let me know in the comments!​

​Beneficial Animals

If you have the luxury of having animals in the garden, you can use them as insect control as well! Here are two types of animals that are natural predators to grasshoppers.​

Chickens and Guinea Hens

Chickens, guinea hens, and even ducks absolutely love munching on grasshoppers. Contrary to what the grocery stores would have you believe, chickens love to eat bugs and are omnivores, not herbivores.

So, adding some of these birds to the garden is a great way to get fresh eggs with a balanced nutrient profile as well as control your bug problem! The only issue is that chickens can also attack your garden if you’re not careful, so be sure to pen them off when they’re not on the hunt for bugs!​

Birds

Wild birds also enjoy munching on a hopper from time to time. In the summer, see if you can encourage these birds to frequent your garden in search of grasshoppers. The best way to do this is to add posts, trellises, and other vertical structures for them to sit on while they survey the garden.

Grasshopper FAQ

Q. What is the difference between grasshoppers and locusts?

A. Many gardeners think that grasshoppers and locusts are the exact same bug. All locusts are grasshoppers, but not all grasshoppers are locusts. It’s kind of like how all squares are rectangles, but not all rectangles are squares.

Q. So what differentiates a locust from a grasshopper, then?

A. The biggest difference is in their behavior patterns. Locusts fly and swarm together when there are a lot of them in the same place, while grasshoppers do not exhibit this swarming behavior.

Q. Grasshoppers are destroying my strawberries! Help!?

A. If these green hoppers are munching on your strawberries, make sure to use safe methods for control, especially if you are spraying. Remember, you’re eating the berries!

Many commercial strawberry farmers have good results with either the garlic spray or hot pepper wax spray that i mentioned above. While it’s true that grasshoppers won’t actually eat the berries, they can decimate the leaves, which will severely inhibit the yield of your strawberry plants.

www.epicgardening.com

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