Agricultural Entomology MCQ Question and Answer | Agriculture MCQ Question

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.

Haplogastran abdomen is present in Scarabaeidae.
The family Scarabaeidae, as currently defined, consists of over 30,000 species of beetles worldwide; they are often called scarabs or scarab beetles.
Scarabs are stout-bodied beetles, many with bright metallic colours, measuring between 1.5 and 160 millimetres (0.059 and 6.3 in). They have distinctive, clubbed antennae composed of plates called lamellae that can be compressed into a ball or fanned out like leaves to sense odours.

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.

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.

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.

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.

Type of linkage found in trehalose is α-1, 1.
Trehalose is a nonreducing disaccharide in which the two glucose units are linked in an α,α-1,1-glycosidic linkage. This sugar is present in a wide variety of organisms, including bacteria, yeast, fungi, insects, invertebrates, and lower and higher plants, where it may serve as a source of energy and carbon.
It has been shown in several experiments that α,α-trehalose, a disaccharide consisting of two α-glucopyranose rings connected via a (1→1) glycosidic linkage, is particularly effective at preventing membrane damage upon drying in comparison to other sugar molecules.

Minning and skeletanization of cabbage leaves are the characteristic damage symptoms of Diamond back moth (Plutella xylostella).
Diamondback moth larvae feed on cole crop leaves between the large veins and midribs. They prefer to feed on the lower leaf surface, leaving the upper epidermis intact thereby creating a “window-paning” effect. Severe feeding damage will stunt cabbage and cauliflower heads.
Skeletonizing resembles chewing of plant leaves between ribs and veins, and sometimes holes in forming cabbage heads.

I P M relies heavily on Economic threshold level.
Integrated pest management (is a way to control insects without relying solely on pesticides. It uses long-term prevention of pests or their damage through a combination of techniques such as biological control, habitat manipulation, change of cultural practices, and uses resistant plant varieties.
Economic Threshold Level (ETL) is the index for making pest management decisions. It is defined as the pest population density at which control measures should be initiated against an increasing pest population to prevent economic damage.

Extremely toxic class of pesticides have the Bright red colour of lower triangle.
Toxicity labels like red label, yellow label, blue label and green label are mandatory labels employed on pesticide containers in India identifying the level of toxicity (that is, the toxicity class) of the contained pesticide.
The schemes follow the Insecticides Act of 1968 and the Insecticides Rules of 1971 and contain information such as brand name, name of manufacturer, name of the antidote in case of accidental consumption etc.
Red label is extremely toxic having maximum percentage of lethal dose.