The infestation of planthoppers is often mistaken for powdery mildew of cannabis.
This tiny bug sucks the sap from hemp stems and leaves, and produces sweet secretions and white flocs.
After the larvae retreat, a lot of white flocs will be left behind.
There are more than 2000 species of planthoppers, the common ones are
Black-Edged Yellow-ridged Planthopper
Long green planthopper
Among them, the brown planthopper, the white-backed planthopper and the Laodelphax striatellus have the strongest damage ability.
Planthoppers are herbivorous annual insects, commonly known as fire midges, and are the main pests of agriculture. The larva is about 3 mm long, and the adult is about 5 mm long. They also spread many plant pathogenic bacteria.
This bug finds plants by flying and spreads its eggs. It has strong reproductive ability and strong resistance to drugs, making it a very tricky little flying insect. The larvae secrete sweet secretions that attract ants and many other pests, just like aphids. At the same time, it will secrete white flocs, which will hinder the respiration and photosynthesis of the leaves, strengthen the adhesion of the larvae, and become a hotbed for various pathogenic bacteria.
Although the feeding of planthoppers does little harm to cannabis, its various secretions lay a huge safety hazard to the plant, and its harm should not be underestimated.
The larvae are like tiny bread crabs.
Adults of planthoppers can fly, and their transmission ability is extremely strong, making it difficult to eradicate.
How to control planthoppers?
- Remove the decaying plants around the planting environment in outdoor planting, and strengthen the ventilation and filtration system in indoor planting. Planthoppers invade new plants mainly by flying and lay eggs in decaying plants.
- The insecticidal lamp, the adults of planthoppers have phototaxis, which can effectively kill the adults of planthoppers.
- Green sticky insect board, the adults of planthoppers have green tendency, and the green sticky insect board can also trap and kill a large number of adult planthoppers.
- Use acetamiprid insecticides, because planthopper larvae will secrete white flocs to resist running water, and adults will fly. Therefore, when using insecticides, dilute it at twice the prescribed dilution factor to reduce toxicity, and spray the plants, soil and the surrounding planting environment with a large amount of insecticide solution.
- Use thiamethoxam and pymetrozine insecticides, which have relatively low toxicity and can be sprayed on cannabis in flowering period.
- Use diazetriene land ring, add some spreading agent to enhance the adhesion of pesticides.
Planthoppers are very resistant and can bring many other pathogenic bacteria. After they are discovered, they must be killed by heavy medicine immediately. In order to prevent planthoppers from developing resistance, it is recommended to use various insecticides alternately. If the pest is severe, treat the affected plants and the surrounding soil before the pest spreads.