Sharpen your knowledge of integrated pest management strategies for controlling jassids and other pests affecting fennel crops. Explore key concepts to help protect fennel yields efficiently and sustainably.
Which one of the following is a primary visible symptom of jassid infestation on fennel plants?
Explanation: Leaf curling and yellowing along the margins are classic symptoms caused by jassid feeding. Dark brown fruit spots are more typical of fungal diseases, wilting overnight is usually due to borer pests or root issues, and powdery patches correspond to powdery mildew, not jassids.
What is the most effective method for monitoring the population of jassids in fennel fields?
Explanation: Regular random leaf inspection helps assess actual jassid levels for timely action. Insecticides should be used as per threshold-based monitoring, soil moisture is unrelated to jassid detection, and webbing is associated with mites or caterpillars, not jassids.
Which approach is most recommended in Integrated Pest Management (IPM) for controlling jassids on fennel?
Explanation: Growing resistant varieties supports sustainable and long-term control as part of IPM. Frequent pesticide use can lead to resistance and environmental harm. Daily irrigation does not impact jassid populations, and deep shade can reduce plant health.
Which beneficial insect is known to help reduce jassid populations in fennel fields?
Explanation: Ladybird beetles are effective predators of soft-bodied pests like jassids. Grasshoppers are themselves pests, silkworms feed on mulberry leaves and play no role in fennel, and mango hopper is a pest, not a predator.
When is it advisable to apply insecticides for controlling jassids in a fennel crop?
Explanation: Pesticides are best applied when pest populations are above economic thresholds to avoid misuse and resistance. Applying at planting, on a fixed day, or only after rain does not consider actual pest pressure and may not be effective.