Cotton and to a lesser extent eggplant, potato, pepper and okra
Cotton jassids are sap-sucking pests of cotton and several other host plants. Among the many species attacking cotton, Amrasca devastans is considered the most significant. Cotton jassids are mainly active during summertime. Adults have a green to pale-yellow color and tend to jump when feeling threatened, quickly fleeing the situation. Cotton jassids are most likely found on the underside of leaves. In high infestation levels, there is a reduction in plant growth, the leaves curl downwards, and the leaves tend to develop an overall pale color with red margins.
Monitor: It is easier and more cost effective to overcome infestations and successfully eliminate cotton jassids during the initial stage of infestation. Cotton jassids are most susceptible to insecticides during the nymphal stage.
Plant resistant varieties: Some cotton varieties compared to other varieties are less susceptible to cotton jassids and are rarely attacked. Even if there is a high level of infestation, if the cotton crops are jassid resistant, spraying applications are not necessary.
Make it a routine to monitor crops regularly and search plants for the presence of cotton jassids and the above described symptoms.
Maintain a healthy plant: Weak plants are more vulnerable to cotton jassids damage than healthy plants. Therefore, adequate irrigation and fertilization regimes are important. However, excessive use of fertilizers, especially containing nitrogen, can result in higher infestations.
Sanitation: Many weeds are hosts for cotton jassids. Clean weeds and wild grasses in and around the crops as often as possible. This is important since it can reduce the overall population of leafhoppers.
The following insecticides are still in use in one or more parts of the world: Flonicamid, buprofezine, imidacloprid, thiamethoxam, clothianidin, sulfoxaflor, bifenthrin, deltamethrin, chlorpyrifos, dimethoate, and carbaryl(Note that while carbaryl-based insecticides are still used in some countries, there are safer alternatives available today)
Insecticides should be directed towards the undersides of leaves since that is where jassids are mainly found.
Neem oil and mineral oil can be applied.
Jassids have several known beneficials predators, such as Chrysoperla carnea (lacewing), Scymnus sp, and Anagrus atomus. Therefore, careful thought should be taken when planning to use the above chemicals marked in red. If the jassids population remains unchanged after a single application of one chemical marked in red, future applications could make the situation worse by wiping out the presence of beneficial insects within the field’s close surroundings.
*Names marked in red are considered to be highly poisonous to beneficial insects.
*Names marked in green are considered to be organic and IPM (integrated pest management) compatible.