Agricultural Entomology - Study Mode
[#471] Citres Nematode is
Correct Answer
(B) Tylenculus
Explanation
Solution: Citrus Nematode is Tylenculus. Tylenchulus semipenetrans, also known as the citrus nematode or citrus root nematode, is a species of plant pathogenic nematodes and the causal agent of the slow decline of citrus. T. semipenetrans is found in most citrus production areas. Their feeding strategy is semi-endoparasitic and has a very narrow host range among commonly grown crops. These nematodes are considered major plant-parasitic nematode because they can cause 10 - 30% losses reported on citrus trees.
[#472] Following insecticide has anticholinesterase action on insect nervous system
Correct Answer
(A) Malathion
Explanation
Solution: Malathion insecticide has anticholinesterase action on insect nervous system. Malathion and other organophosphate insecticides bind to the enzyme acetylcholinesterase (AChE) at nerve endings throughout the bodies of insects. Malathion is a man-made organophosphate insecticide that is commonly used to control mosquitoes and a variety of insects that attack fruits, vegetables, landscaping plants, and shrubs.
[#473] Pheromone trap is used for capturing
Correct Answer
(C) Adults males
Explanation
Solution: Pheromone trap is used for capturing adult males. A pheromone trap is a type of insect trap that uses pheromones to lure insects. Sex pheromones and aggregating pheromones are the most common types used. Pheromone traps capture male moths and are used to monitor when the moth flight starts and its population dynamics. Pheromone traps use chemical signals (pheromones) emitted by females to attract a mate (therefore pheromone traps only catch males of that species).
[#474] Which one is army worm (attack at milking stage)?
Correct Answer
(D) None of these
Explanation
Solution: None of the given options is army worm. The armyworm (Mythimna seperata) is a species in the order Lepidoptera and one of the species of the fall armyworm moths distinguished by their larval life stage. The term "armyworm" can refer to several species, often describing the large-scale invasive behavior of the species' larval stage. It is regarded as a pest and can damage and destroy a wide variety of crops, which causes large economic damage.
[#475] In Hemiptera accessory pulsating organs are present in
Correct Answer
(C) Legs
Explanation
Solution: In Hemiptera accessory pulsating organs are present in the Legs. The dorsal vessel ("heart"), insects have accessory pulsatile organs ("auxiliary hearts") that supply body appendages with hemolymph. They are indispensable in the open circulatory system for hemolymph exchange in antennae, long mouthparts, legs, wings, and abdominal appendages.