Agricultural Entomology - Study Mode

[#281] Caterpillars drop on strand of silk when disturbed is known as
Correct Answer

(B) Reflex dropping

Explanation

Solution: Caterpillars drop on strands of silk when disturbed is known as Reflex dropping. Reflex bleeding is a defensive behaviour in some insects where a noxious fluid is exuded by the insect when threatened. The fluid flows out through pores in the exoskeleton. The secretion consists of a bitter fluid, including haemolymph and noxious chemicals.

[#282] Biological control component is central to advance agricultural production. Which of the following is used as a third generation pesticide?
Correct Answer

(B) Insect hormone analogues

Explanation

Solution: Biological control component is central to advancing agricultural production. Among the given options Insect hormone analogues are used as a third generation pesticide. Three insect hormones have been implicated in the control of division of labor in insect societies: juvenile hormone (JH), ecdysteroids and insulin. Juvenile hormone analogues (JHAs) are a type of insect growth regulator used for pest control. In immature stages of insects, the titer of juvenile hormone (JH) is maintained at a high level to ensure larval growth and suppress metamorphosis.

[#283] Which one of the following pest is an introduced pest of coffee?
Correct Answer

(B) Berry borer

Explanation

Solution: Berry borer is an introduced pest of coffee. The coffee stem borer is the pest of Arabica coffee, whereas the shot hole borer prefers robusta coffee. In certain areas the severe attack of white stem borer leads to discontinuation of the crop. Several insect pests have been reported in coffee, the most important being the coffee leaf miner, the coffee berry borer, and the coffee stem borers.

[#284] Wota trap is used for
Correct Answer

(B) Groundnut leaf miner

Explanation

Solution: Wota trap is used for Groundnut leaf miner. Wota Trap is easy to assemble on a single pole. It consists of an adapter, basin to hold water (mixed with kerosene/ detergent) and a lure holder with a canopy. It can be effectively used to trap Sugarcane borers, Tuta moths, Brinjal borers. Groundnut leaf miner, is a very serious pest of groundnuts both in the rainy and post rainy season crops and is regarded as the most important pest threatening groundnut production in Uganda.

[#285] Maggots as predators belongs to the family
Correct Answer

(C) Both A and B

Explanation

Solution: Maggots as predators belong to the family Syrphidae and Cryptochaetidae. The Cryptochetidae are a small family of tiny flies (generally 2 to 4 mm long). They are metallic blue black, stoutly built, with the head broad and high and with clear wings. Hover flies or syrphid flies, make up the insect family Syrphidae. In these species, the larvae also called maggots in case of flies are insectivores and prey on aphids, thrips, and other plant-sucking insects.