Monophagous Pests- are those insects which are known to feed on only a single species of plants. A pest rating proposal is needed to establish a permanent pest rating. The majority of the species within these three families feed on a narrow host plant range, as indicated by the low PD and FMD values . .
What is a monophagous insect?
A monophagous insect restricts itself to a single host species -- it is a consummate specialist, adapting its behavior and physiology to a single nutritional resource. Some of these insects must rely on intestinal symbionts to supply essential dietary components that are not supplied by their host (see Insect Nutrition ).
What are polyphagous pests?
Polyphagous pests are those which feed on plants belonging to diverse taxonomic groups. Generally, these pests multiply in large number are voracious feeders and cause considerable damage to agricultural crops. The most important polyphagous pests are termites, grasshoppers, hairy caterpillars, cutworms, etc.
What are the monophagous pests of rice?
Yellow stem borer (YSB), Scirpophaga incertulas (Walker) (Lepidoptera: Crambidae), a major monophagous insect pest of rice, causes significant yield losses. Nymphalidae, and Pieridae) primarily consist of monophagous species without a pest status . The monarch or wanderer .
What is an oligophagous insect?
Oligophagous insects have a slightly broader host range -- often adopting any plant within a close circle of related genera or the members of a single taxonomic family. These insects are less likely to starve if a preferred host plant is unavailable.
What does Monophagous mean?
Definition of monophagous : feeding on or utilizing a single kind of food especially : feeding on a single kind of plant or animal.
What is Monophagous insect pest?
Monophagous pests are those insects, which are known to feed on only a single species of plants. For example, Scirpophaga incertulas.
What do you mean by Polyphagous pest?
Polyphagous pests are primarily agricultural pests that feed on economically important agricultural and horticultural crops of wide taxonomic diversity across the globe. They cause immense damage across different crop varieties owing to their generalist and voracious food habits.
What is Oligophagous pest?
zoology. (of an insect) feeding on a limited range of foodstuffs, esp plants.
What are monophagous Oligophagous and Polyphagous pests?
Monophagous herbivores are de- fined as those feeding on 1 or more plant species within a genus. Oligophagous herbivores are restricted to feeding on 2 or more genera in a family or closely related families, and polyphagous herbivores are defined as feeding on species from two or more plant families.
Which is the monophagous pest of rice?
Yellow stem borerYellow stem borer (YSB), Scirpophaga incertulas (Lepidoptera: Crambidae), a monophagous pest of paddy is considered as most important pest of rain fed low land and flood prone rice eco-systems.
What are the Examles of Oligophagous pests?
Examples. The diet of the yucca moths is restricted to the developing fruits of species of yucca while the sea hare, Aplysia juliana (Quoy & Gaimard), is found on and feeds only on a single alga, Ulva lactuca (Linnaeus) in east Australian waters. These are both narrow oligophages.
What is a specialist insect?
Specialist insects have developed, over time, the ability to feed on plants that have physical or chemical deterrents that keep generalist insects at bay. Although specialist insects can feed on plants that can be toxic to other insects, they can't easily switch to feed on novel, non-native plants.
Why are insects decomposers?
They accelerate decay by increasing the surface area exposed to weathering and the action of other decomposers. They are largely responsible for creating a layer of humus that often covers the soil.
What is this?
An insect which is known for attacking on different plant species is a polyphagous insect. It is not a specific pest of any particular crop.
4.1: Locust
Locusts are international pest. It is the type of pest which can cause famine. Thye attack as group, although they don’t fly against the wind.
4.2: Termite
Termite is a very common insect. It is a devastating pest. Young termites directly damage its host by feeding on root and stem.
4.3: White grub
White grub is a polyphagous insect, but sorghum, pearl millet, sugarcane, groundnut, pigeon pea, french bean, chilli, bringal, and okra are the major hosts.
4.4: Bihar hairy caterpillar
The caterpillars cut and chew leaves. It starts to damage the crop from the beginning of monsoon. Attack is severe in low rain area. The pest heavily damages groundnut, sesame, sarso, and some vegetables.
4.5: Red hairy caterpillar
The caterpillars cut and chew leaves. It starts to damage the crop from the beginning of monsoon. Red hair caterpillar prefers low rainfall situations and light soil. This is one of the major pest in North India.
