Agricultural Entomology - Study Mode

[#266] The first report of biological control of insect pest in India was made by
Correct Answer

(A) Rothney

Explanation

Solution: The first report on biological control of insect pests in India was made by Rothney. Biological control is the use of living organisms to suppress pest populations, making them less damaging than they would otherwise be. Natural enemies of insects play an important role in limiting the densities of potential pests. These natural enemies include predators, parasitoids, and pathogens. During this decade, in the US, the Missouri State Entomologist C. V. Riley and the Illinois State Entomologist W. LeBaron began within-state redistribution of parasitoids to control crop pests.

[#267] Maggot disease of silkworm is caused by
Correct Answer

(A) Tricholyga sorbillans

Explanation

Solution: Maggot disease of silkworm is caused by Tricholyga sorbillans. Maggot disease is caused by Tricholyga sorbillans, a fly belonging to the order Diptera and family Tachinidae. The symptom of this disease is the presence of milky white cylindrical eggs on the skin of silkworm larvae. This fly lays eggs on silkworm larvae that vary from several to more than fifty but usually they are two or three.

[#268] Virachola isocrates is the fruit pest of
Correct Answer

(D) Pomegranate

Explanation

Solution: Virachola isocrates is the fruit pest of Pomegranate. Deudorix isocrates (Virachola isocrates), the common guava blue, is a butterfly in the family Lycaenidae. It was described by Johan Christian Fabricius in 1793. It is found in India, Sri Lanka and Indochina in the Indomalayan realm. The larvae feed on Randia dumetorum, Eriobotrya japonica, Psidium guajava, Tamarindus indica, Strychnos nux-vomica and Gardenia latifolia. It is a pest of pomegranates in India.

[#269] This nematode is intermediate which can live entirely above ground & subterranean form also
Correct Answer

(D) Tylenchulus

Explanation

Solution: Tylenchulus nematode is intermediate and can live entirely above ground & in subterranean form also. 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 and diverse soil textures worldwide. Their feeding strategy is semi-endoparasitic and has a very narrow host range among commonly grown crops. These nematodes are considered major plant-parasitic nematodes because they can because 10 - 30% losses reported on citrus trees.

[#270] The non-preference plant resistance to insects is also known as
Correct Answer

(B) Antixenosis

Explanation

Solution: The non-preference plant resistance to insects is also known as Antixenosis. Nonpreference refers to various features of the host plant that make the host undesirable to insects for food, shelter, or reproduction. It is also termed antixenosis. Antixenosis occurs when there is non-preference for the resistant plant compared to a susceptible one. When the life-history parameters (survival, development, fecundity) of the insect are affected, the term antibiosis can be applied.