Insecticide For Thistle Caterpillar
The thistle caterpillar, Vanessa cardui, is the larva of the adult painted lady butterfly. It takes its name from the Canada thistle, which is a preferred host. It is considered a sporadic pest of soybean. Larvae have a wide host range that includes over 300 plant species.
This pest does not overwinter in northern growing areas but migrates up from southern states and Mexico each spring. Eggs are laid singly on the upper side of leaves of host plants, including Canada thistle, sunflower, and soybean. Caterpillars hatch and form webs by tying leaves together with silk, which creates a protected area for them to feed in. Caterpillars feed on leaves causing defoliation in the upper canopy of the soybean plant. After two to six weeks, they form a chrysalis, which hangs from the host plant. After seven to 10 days, the butterfly emerges. There are two generations per year in the Midwest but there may only be one in more northern production areas.
Scouting
Adults (Figure 1)
- Upper side of front wings are red–orange and brown, with black and white spots.
- Hindwings are red–orange and brown, with four black “eye spots” along the edge.
Figure 1. Adult painted lady butterfly.
Eggs
- Eggs are light green and barrel–shaped.
Caterpillar/larva (Figure 2)
- The brown to black body is one and one-fourth inches long and has yellow striping on both sides.
- Branched, spiny hairs covering the body give the caterpillar a prickly appearance.
Caterpillars form a webbing in the leaves where they feed.
Figure 2. Painted lady (thistle) caterpillar. Photo: University of Nebraska – Lincoln, CropWatch
Thistle caterpillars tend to aggregate toward the field edges, especially if there is Canada thistle present along the edges.
To estimate percent defoliation, examine a minimum of 10 plants:
- From each plant, select a leaf from the top, middle and bottom third of the plant.
- Use Figure 3 to estimate percent defoliation for each leaf and calculate the average percent defoliation across the three leaves from each plant and then across the multiple plants.
- This average percent defoliation for the field’s canopy can be compared to treatment thresholds.
Figure 3. Levels of soybean defoliation. Injury is often overestimated. CropWatch – University of Nebraska – Lincoln
Treatment Thresholds for Caterpillars in Soybeans
In vegetative (pre-flowering) stages, consider treatment if the insects are present and feeding, and defoliation will exceed 30%. In pod-forming or pod-filling stages, consider treatment if the insects are present and defoliation will exceed 20%. This normally requires about 8 to 10 caterpillars per foot of row. If plants are still small, then best judgement may have to be made. One reference suggests a treatment guideline of 3 larvae per row foot in young soybeans, another when damage is severe and plants are being killed.
Keep in mind, other foliar feeding insects including soybean looper, green cloverworm and grasshoppers may be feeding at the same time and defoliation damage is cumulative among the pests present.
Insecticide treatments
Several foliar insecticides labelled on soybeans have activity against these and other caterpillars. Consult your state Extension office for recommended products and rates. Always read and follow label directions for use.
Insecticide For Thistle Caterpillar
Thistle caterpillars, or thistle moths, are a species of butterfly. They are named for their tendency to feed on thistles, but they also eat other plants in the same family (including ragweed). They are considered to be pests because they eat crops and can infest homes.
The thistle caterpillar is typically found in North America. It has a black body with yellow stripes and spots on its wings. It grows from 1 1/2 inches to 6 inches long as an adult. The female lays eggs on thistle leaves, which hatch into larvae that look like worms with six legs and no eyes. The larvae are usually green or brown in color and have a smooth texture with small hairs on their bodies.
List Of Insecticide For Thistle Caterpillar
- INSECT KILLER – This pest control is great for use on cabbage looper, hornworms, tent caterpillar, gypsy moth, bagworm and many more.
- PROTECTS FRUITS, VEGETABLES, SHADE TREES & ORNAMENTALS – Designed for use on broccoli, cauliflower, kale, mustard greens, eggplant, pepper, melons, tomatoes, cabbage, shade trees and ornamentals.
- DOESN’T HARM BENEFICIAL INSECTS – Kills worms and caterpillar stage insects while causing no harm to birds, earthworms, or beneficial insects, such as honeybees and ladybugs.
- FAST ACTING FORMULA – Must be eaten by worms or caterpillars to be effective. After ingesting, bugs immediately stop feeding and will die within 2-3 days.
- ORGANIC GARDENING – The active ingredient of the product is a natural strain of the bacterium Bacillus thuringiensis, which is a leading insecticide used worldwide. Approved for organic gardening, our product is safe for use around people and pets.
Additional Info :
| Item Dimensions | |
| Height | 12 Inches |
| Width | 3 Inches |
| Length | 6 Inches |
| Weight | 2.33 Pounds |
| Release Date | 2021-11-10T00:00:01Z |
- KILLS FAST: Kills mosquitoes, listed ant types, fleas and other listed insects
- QUICKFLIP HOSE-END SPRAYER: Hose-end-sprayer activates spray at the flip of a switch – just grip, flip and go
- LASTS ALL SUMMER: Controls up to 12 weeks against house crickets, carpenter ants, harvester ants, lady beetles and earwigs
- COVERAGE: Treats up to 5,000 square feet of lawn
- NO MIXING REQUIRED: Attach the sprayer to a garden hose to treat your lawn, landscape and outdoor surfaces where insects hide
Additional Info :
| Color | Silver Bottle |
| Item Dimensions | |
| Height | 11.5 Inches |
| Width | 2 Inches |
| Length | 5.25 Inches |
| Weight | 1.08 Pounds |
- Ortho Home Defense Insect Killer for Indoor & Perimeter2 with Comfort Wand kills ants, cockroaches, spiders, fleas, ticks and other listed bugs; the formula is odor free, won’t stain, and keeps listed bugs out
- KILLS BUGS INSIDE: Kills those annoying home-invading insects, including ants, cockroaches, spiders, fleas, ticks, scorpions, beetles, silverfish, centipedes and millipedes
- KEEPS BUGS OUTSIDE: Creates a bug barrier that will kill bugs you have and prevents new bugs for up to 12 months (applies to ants, roaches and spiders indoors on non-porous surfaces)
- NO STAINING OR STINK: This spray can be used indoors and out, leaves no residue, and has no odor; people and pets may re-enter treated areas after spray has dried
- WAND MAKES APPLICATION EASY: The Comfort Wand eliminates hand fatigue, and there’s no pumping required, making it easy to spray along your home’s perimeter–indoors and outside
Additional Info :
| Color | White |
| Item Dimensions | |
| Height | 4.88 Inches |
| Width | 12 Inches |
| Length | 8.95 Inches |
| Weight | 0.73 Pounds |
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Additional Info :
| Color | Blue |
| Item Dimensions | |
| Height | 1.38 Inches |
| Width | 3.35 Inches |
| Length | 12 Inches |
| Weight | 4.2 ounces |
