Agricultural Entomology - Study Mode
[#336] High moisture favours the attack of which nematode?
Correct Answer
(B) Heterodera sp.
Explanation
Solution: High moisture favours the attack of Heterodera sp. nematode. Heterodera is a genus of nematodes in the family Heteroderidae. Members of the genus are obligate parasites and different species attack different crops, often causing great economic damage. The genus is unique among nematode genera because of the ability of the female to transform into a tough, brown, cyst that protects the eggs which have been formed within her body.
[#337] The pronotum is ideally seen in the following insect
Correct Answer
(D) Cockroach
Explanation
Solution: The pronotum is ideally seen in the Cockroach insect. The pronotum is a prominent plate-like structure that covers all or part of the thorax in cockroach. The pronotum covers the dorsal surface of the thorax. It is a section of the thorax that lies in front of the sections that bear the legs and wings.
[#338] Metarrhizium anisopiliae targeted against sugarcane pyrilla and rhinoceros beetle and commercially available under the trade name of
Correct Answer
(C) Biomax
Explanation
Solution: Metarrhizium anisopiliae is targeted against sugarcane pyrilla and rhinoceros beetle and is commercially available under the trade name Biomax. It is a fungus that grows naturally in soils throughout the world and causes disease in various insects by acting as a parasitoid. The fungus then develops inside the body, eventually killing the insect after a few days, this lethal effect is very likely aided by the production of insecticidal cyclic peptides.
[#339] The holes at the base of sorghum penduncle are due to
Correct Answer
(A) Chilo partellus
Explanation
Solution: The holes at the base of sorghum peduncle are due to Chilo partellus. Chilo partellus, the spotted stalk borer or spotted stem borer, is a moth in the family of Crambidae. C. partellus attacks several grass species which can be both cultivated and wild. Cultivated crop hosts include but are not limited to maize, sorghum, pearl millet, rice and sugarcane. The first indication of stem borer infestation is the appearance of small elongated windows or round holes due to feeding by the young larvae. These damage symptoms on the leaves appear in 15 to 25 days old crops.
[#340] This genus has enlarged phasmids but situated not opposite to each other
Correct Answer
(A) Scutellonema
Explanation
Solution: Scutellonema genus has enlarged phasmids but is situated not opposite to each other. Scutellonema is a genus of nematodes belonging to the family Hoplolaimidae. Nematodes of the genus Scutellonema are characterized by scutella (enlarged phasmids) in the lateral fields. The scutella are opposed (at the same location on either side of the body) and are located close to the level near the anus.