Green Semiloopers, also known as Chrysodeixis includens, are a common soybean pest that can cause significant damage to the crop. These caterpillars eat through the plant’s leaves, causing defoliation and reducing crop yields. Fortunately, there are several methods for controlling green semiloopers in soybean crops.
1. Timely scouting
The key to controlling any pest is to detect it early. Scouting the soybean crop at regular intervals is crucial as it helps in identifying the pests in their early stages. Typically, green semiloopers hatch in mid to late June, so it is essential to start scouting the soybean crop from June onwards. The method of scouting includes sweep-netting, visual examination of leaves, and pheromone traps. Early detection and intervention can help minimize the damage caused by green semiloopers.
2. Biological control
Biological control is one of the most effective methods of controlling pests, including green semiloopers. Predatory insects and parasitoids can help in reducing green semilooper populations. Parasitoids such as Braconids and Trichogramma wasps are natural enemies of the green semilooper and can help control their populations. On the other hand, predatory insects like ladybugs and lacewings prey on green semilooper eggs, thereby controlling their populations.
3. Chemical control
Several synthetic insecticides are available to control green semiloopers; however, their indiscriminate use can lead to resistance and environmental pollution. Therefore, it is essential to use insecticides only when populations are high and other control methods fail. Furthermore, chemical control must be done judiciously by following proper mixing, application, and safety protocols.
4. Host plant resistance
Several modern soybean varieties have built-in resistance to green semilooper infestations. Planting resistant cultivars can help minimize the need for chemical control measures.
5. Cultural control
Cultural control practices such as crop rotation, tillage, and planting time can affect green semilooper populations. By breaking the life cycle of green semiloopers through crop rotation and fall plowing, their populations can be reduced. Additionally, early planting of soybean crops can reduce green semilooper infestations as they lay eggs later in the season.
In conclusion, controlling green semiloopers in soybean crops takes a multi-faceted approach. Timely scouting, biological controls, chemical controls, host plant resistance, and cultural control practices all play crucial roles in managing these pests. By implementing these control methods, farmers can effectively reduce green semilooper populations and protect their soybean crops and harvests.