Agricultural Entomology - Study Mode

[#291] Wilting of groundnut plants in patches with damaged roots is caused by
Correct Answer

(A) Holotrichia consanguinea

Explanation

Solution: Wilting of groundnut plants in patches with damaged roots is caused by Holotrichia consanguinea. This is a polyphagous pest both in the grub and adult stages and inflicts heavy damage to the various fruit trees, their nurseries, vegetables, lawns and field crops. Holotrichia consanguinea is the predominant species of root grub damaging groundnut and in endemic areas, the damage to groundnut ranges from 20% to 100%.

[#292] Chitin inhibitor compound is
Correct Answer

(B) Dimilin

Explanation

Solution: Chitin inhibitor compound is Dimilin. Chitin synthesis inhibitors (CSIs) are used to control L. salmonis in aquaculture. CSIs act by interfering with chitin formation and molting. DIMILIN is a chemical insecticide (growth regulator) that works by preventing the formation of chitin, an important structural component of the outer skin of the larvae. L. dispar caterpillars periodically shed their skin (molt) as they grow, forming new larger skins.

[#293] Haemocoelus vivipary is observed in which insect order is
Correct Answer

(D) Strepsiptera

Explanation

Solution: Haemocoelus vivipary is observed in insect order that is Strepsiptera. Haemocoelus vivipary involves embryos developing free in the female's haemolymph with nutrients taken up by osmosis. This form of internal parasitism occurs only in sterpsiptera and some gall midges. The Strepsiptera are an order of insects with eleven extant families that include about 600 described species. They are endoparasites in other insects, like wasps, leafhoppers, silverfish, and cockroaches. Strepsiptera eggs hatch inside the female, and the planidium larvae can move around freely within the female's haemocoel this behavior is unique to these insects. The offspring consume their mother from the inside in a process known as hemocelous viviparity.

[#294] Pebrine disease is found in
Correct Answer

(B) Silk worm

Explanation

Solution: Pebrine disease is found in the Silk worm. Pebrine is the most important disease of silkworm that is caused by the protozoa called Nosema bombycis. Pebrine has commonly observed in all seasons but during the rainy and winter season, the infection level is more. It is transmitted to offspring by transovarial.

[#295] In cockroach DDT is converted to
Correct Answer

(B) DDP