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The electrical penetration graph or EPG is a system used by biologists to study the interaction of insects such as aphids, thrips, and leafhoppers with plants. Therefore, it can also be used to study the basis of plant virus transmission, host plant selection by insects and the way in which insects can find and feed from the phloem of the plant.
The first phase is stimulation by odours characteristic to the host-plant. This induces the insect to try to land on the plant it seeks. But insects avoid landing on brown (bare) soil. So if only the host-plant is present, the insects will quasi-systematically find it by landing on the only green thing around. This is called an "appropriate ...
Phthorimaea operculella, also known as the potato tuber moth or tobacco splitworm, is a moth of the family Gelechiidae.It is an oligophagous insect that feeds on the plant family Solanaceae and is especially known for being a major pest of potato crops. [1]
Herbivores and Plant Tannins with Gillian A. Cooper-Driver and M. Bilgener, London: Academic Press, 1989. Insect-Plant Interactions, Boca Raton: CRC Press, 1990. Host-Plant Selection by Phytophagous Insects with R.F. Chapman, New York: Chapman & Hall, 1994. Six Legs Walking: Notes from an Entomological Life, Florida: Raised Voices Press, 2019.
The range of plants on which a herbivorous insect feeds is known as its host range. This can be wide or narrow, but it never includes all plants. A small number of insects are monophagous, feeding on a single plant. The silkworm larva is one of these, with mulberry leaves being the only food consumed.
Naturally, J. coenia consider iridoid glycosides in the host plant selection for larvae. This inclination for iridoid glycosides may also reflect its role in oviposition and microhabitat selection. [5] Aucubin and catalpol are two other chemicals that can be stimulants and attractants for larval feeding behaviors. [7]
Host plant selection is crucial because diamondbacks spend the majority of their life near their host plant. [6] The diamondback moth lays its eggs only on plants in the family Brassicaceae. [4] Nearly all cruciferous vegetable crops are attacked, but some are favored over others. These include
The life cycle of the stick insect begins when the female deposits her eggs through one of these methods of oviposition: she will either flick her egg to the ground by a movement of the ovipositor or her entire abdomen, carefully place the eggs in the axils of the host plant, bury them in small pits in the soil, or stick the eggs to a substrate ...