What pesticide to use to control aphids in the yard
Aphids are among the most destructive pests on Earth. About 250 of these species are serious pests for agriculture, forestry and horticulture. Aphids vary in size, with body lengths ranging from one to ten millimeters. So what pesticide should be used for aphids in the yard?
1. What pesticide to use for aphids in the yard
For aphids in the yard, pesticides such as acetamiprid, acetamiprid, buprofezin, nitenpyram and buprofezin can be used. The natural enemies of aphids include ladybugs, hoverflies, parasitic wasps, aphid midges, crab spiders, lacewings and entomopathogenic fungi.
2. Methods for controlling aphids
1. Chemical control.
When large numbers of aphids are found, spray pesticide promptly. Use a 1000-fold dilution of 50% malathion emulsion, or a 1000-fold dilution of 50% fenitrothion emulsion, or a 3000-fold dilution of 50% pirimicarb wettable powder, or a 3000-fold dilution of 2.5% deltamethrin emulsion, or a 3000-fold dilution of 2.5% fenpropathrin emulsion, or a 1500-2000-fold dilution of 40% imidacloprid water-soluble concentrate, etc., and spray the plants 1-2 times; prepare chili water at a ratio of 1:6—1:8 (boil for about half an hour), or spray with laundry detergent water prepared at a ratio of 1:20—1:30, or spray with a mixed solution of laundry detergent, urea and water prepared at a ratio of 1:20:400, spraying the plants continuously 2-3 times; for aphids such as the peach powdery aphid that are themselves covered with wax powder, when applying any pesticide, 1% soapy water or laundry detergent should be added to increase adhesion and improve the control effect.
2. Manual control.
In autumn and winter, whitewash the base of the trunk to prevent aphids from laying eggs; in combination with pruning, cut off damaged branch tips and spent flowers and burn them in a centralized manner to reduce the overwintering pest population; in winter, scrape off or brush off the dense overwintering egg masses on the bark, and promptly clean up fallen twigs and leaves to reduce overwintering eggs; in spring, when a small number of aphids are found on flowers, they can be brushed clean with a writing brush dipped in water, or the potted flowers can be tilted and rinsed under running tap water while rotating them.
3. Protect natural enemies.
Aphids have many natural enemies, including ladybugs, lacewings, hoverflies and parasitic wasps, which have a strong inhibitory effect on aphids. Apply broad-spectrum pesticides as little as possible, avoid applying pesticides during peak periods of natural enemy activity, and where conditions permit, artificially rear and release aphid natural enemies.
Aphids are distributed very widely around the world, but are mainly concentrated in temperate regions. In addition, species diversity is much lower in the tropics than in temperate zones.