Agricultural Entomology - Study Mode
[#531] Peg like mucron is present in
Correct Answer
(B) Hirschmaniella sp.
Explanation
Solution: Peg-like mucron is present in Hirschmaniella sp. Hirschmanniella oryzae, i.e. rice root nematode (RRN), is among the major pests of rice and is the most common plant-parasitic nematode found on irrigated rice. The phasmids of this species are located in the posterior third of the tail, which is three to five times as long as the body width at the anus, tapering, and usually terminating in a point or mucron.
[#532] The first longitudinal wing vein is
Correct Answer
(C) Costal vein
Explanation
Solution: The first longitudinal wing vein is the Costal vein. The wings are strengthened by several longitudinal veins, which often have cross-connections that form closed "cells" in the membrane. The veins (and their branches) are named according to a system devised by John Comstock and George Needham the Comstock Needham system. The costa (C) is the leading marginal vein in most insects. The costa rarely ever branches because it is at the leading edge, which is associated at its base with the humeral plate.
[#533] The ladder shaped scrapping on the rice leaves is due to
Correct Answer
(A) Dicladispa armigera
Explanation
Solution: The ladder shaped scrapping on the rice leaves is due to Dicladispa armigera. Damage is caused by the adults and larvae of the rice hispa, Dicladispa armigera. Adult beetles scrape the upper surface of leaf blades leaving only the lower layer. Eggs are laid inside minute openings on the tender leaves, generally toward the tip. The grub is whitish-yellow and flattened.
[#534] Linker of Apterygotes and pterygotes is
Correct Answer
(C) Thysanura
Explanation
Solution: Linker of Apterygotes and pterygotes is Thysanura. Thysanura is the now deprecated name of what was, for over a century, recognised as an order in the class Insecta. Another name used to separate the two groups from winged insects is Apterygota. Apterygota and pterygota are two subclasses of insects. Apterygota is a subclass of insects that includes wingless insects, while pterygota is a subclass of insects that includes winged insects.
[#535] Aphids and white flies are effectively controlled by
Correct Answer
(D) Systemic insecticide
Explanation
Solution: Aphids and white flies are effectively controlled by Systemic insecticide. A Systemic fungicide is taken up by a plant and is then translocated within the plant system, it can there by protect the plant from infections and restrict/Control the further growth of existing infungal infections. The soil-applied systemic insecticide imidacloprid can control whitefly nymphs.