Explore key strategies and practices for managing cotton pests, especially bollworms, and make informed decisions to protect yield and crop health. This quiz covers pest identification, control techniques, and integrated approaches in cotton agriculture.
Which distinct physical characteristic helps farmers identify the cotton bollworm (Helicoverpa armigera) larva in their cotton fields?
Explanation: The cotton bollworm larva often has yellowish or pale stripes running lengthwise along its body, aiding identification. Red spots are more typical of some cutworm species. A completely white appearance does not fit common bollworm descriptions. Pairs of horns are characteristic of other caterpillars such as the hornworm.
What is one cultural practice that helps manage bollworm populations in cotton agriculture?
Explanation: Crop rotation with non-host plants interrupts the pest's lifecycle and reduces pest buildup. Synthetic pheromones are part of pest monitoring, not a cultural method. Copper sulfate targets fungal diseases, not insects. Flooding is ineffective and impractical for cotton pest control.
Which biological control agent is commonly used to target bollworm larvae in cotton crops?
Explanation: Trichogramma wasps parasitize bollworm eggs, reducing future generations. Nematodes are mainly used against soil pests. Lady beetles primarily control aphids. Birds of prey focus on larger pests and rodents rather than small caterpillars.
Which method is frequently used by cotton farmers to monitor bollworm infestations and decide on timely interventions?
Explanation: Pheromone traps attract and catch adult moths, allowing farmers to estimate population levels and plan control actions. Soil pH and rainfall relate to crop health but do not monitor bollworm. Leaf spot lesions indicate fungal diseases, not insect infestations.
What is a key concern when using Bt cotton for bollworm management over many seasons?
Explanation: Continuous use of Bt cotton can lead to resistance in bollworm populations, reducing effectiveness. Yield reduction is not common; in fact, yields often increase. Soil nutrients and weeds are not directly impacted by Bt traits.