Agricultural Entomology - Study Mode

[#516] The scientific name of leaf hopper or pyrilla is
Correct Answer

(A) Pyrilla perpusilla Walk

Explanation

Solution: The scientific name of the leaf hopper or pyrilla is Pyrilla perpusilla Walk. Pyrilla perpusilla, commonly known as the sugarcane planthopper, is a planthopper in the family Lophopidae. It is native to Asia where it feeds on grasses and other plants and is a major pest of sugarcane and sorghum. Adult female P. perpusilla lay small batches of eggs on sugarcane leaves, mostly on the underside but sometimes on the upper surface, and during the winter, inside the leaf sheath. The eggs are laid in four or five rows and are protected with filaments of whitish wax protruded by the female. The planthopper feeds on its host by inserting its stylet into a leaf and sucking out the phloem sap.

[#517] Halfmoon shaped scarping or notching of the brinjal leaves are due to
Correct Answer

(D) Myllocerus subfasciantus

Explanation

Solution: Halfmoon shaped scarping or notching of the brinjal leaves is due to Myllocerus subfasciantus. Myllocerus subfasciatus is a species of weevil found in India and Sri Lanka. Adults are known to attack brinjal. Common symptom is the notching of leaf margins. Grubs generally feed on roots causing wilting. Both adults and grubs scrap the lower epidermis of leaves in a characteristic manner leaving behind stripes of uneaten areas. The leaves give a stifled appearance.

[#518] Pupa is green in color in case of
Correct Answer

(B) Anopheles

Explanation

Solution: Pupa is green in colour in the case of Anopheles. Anopheles is a genus of mosquitoes first described and named by J. W. Meigen in 1818. The pupa is comma-shaped when viewed from the side. The head and thorax are merged into a cephalothorax with the abdomen curving around underneath. As with the larvae, pupae must come to the surface frequently to breathe. After a few days as a pupa, the dorsal surface of the cephalothorax splits and the adult mosquito emerges. The pupal stage lasts around 2 - 3 days in temperate areas.

[#519] Which one is systemic insecticide?
Correct Answer

(C) Endosulfan

Explanation

Solution: Endosulfan is systemic insecticide. Endosulfan is an off-patent organochlorine insecticide and acaricide that is being phased out globally. It became a highly controversial agrichemical due to its acute toxicity, the potential for bioaccumulation, and role as an endocrine disruptor. Technical endosulfan is a non-systemic contact and stomach insecticide. It consists of the diastereomers α- and β-endosulfan in the ratio 7 : 3. Both are nonchiral and have significantly different physicochemical properties. Endosulfan has been used in agriculture around the world to control insect pests including whiteflies, aphids, leafhoppers, Colorado potato beetles and cabbage worms.

[#520] The protein content in the raw/fresh pupae of Bombyx mori is
Correct Answer

(D) 79%

Explanation

Solution: The protein content in the raw/fresh pupae of Bombyx mori is 79%. The domestic silk moth (Bombyx mori) is an insect from the moth family Bombycidae. It is the closest relative of Bombyx mandarina, the wild silk moth. The silkworm is the larva or caterpillar of a silk moth. Genetically engineering silkworms to produce proteins, including pharmacological drugs, in the place of silk proteins. Silkworm pupae are agro-industrial by-products with higher nutritional content having a crude protein content of 50 - 80% in defatted meals with a considerable amount of methionine (2–3% of protein), lysine (6 - 16% of protein) and lipids (21 - 38%).