2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
The gamma scoop is found almost everywhere in Russia. Among field crops, she prefers corn, legumes and legumes, potatoes, sunflowers, beets, hemp, flax, etc. This is one of the most dangerous pests of cultivated plants, capable of depriving the long-awaited harvest in the shortest possible time. The main damage is caused by caterpillars, so it is important to conduct a constant and serious fight with them
Meet the pest
The gamma scoop is a pest butterfly with a size of 40 to 48 mm. The color of its front wings can vary from purple-brownish to gray. And this scoundrel got its name due to the fact that her wings are decorated with a silvery speck in the form of the corresponding Greek letter.
The eggs of the scoop reach 0.6 mm in size, are painted in watery-white tones with a slight greenish tinge and are endowed with 36 - 38 radial ribs. The length of the last stage caterpillars is about 40 cm. These voracious parasites have 12 pairs of legs. Their color can be green or greenish-yellow, and sometimes even brownish-green. Sometimes on their body you can see small dark brown spots, and on the upper sides along the entire body there are eight narrow and light longitudinal stripes.
The size of the dark brownish pupae ranges from 15 to 20 mm, and their highly elongated body is equipped at the ends with a large bifurcated hook and four smaller hooks. All pupae are inside translucent spider cocoons, and they are sent to the soil for wintering. Years of butterflies of the first generation in areas with beetroot crops can be observed already in mid-May.
The gamma moth flies mainly in the daytime, which makes it different from other moths. Feeding on flower nectar is vital for these parasites.
As for the fertility of these pests, it is very variable in them. On average, females lay up to 500 eggs, and their maximum number can reach 1400. Butterflies of the second generation can generally be infertile - as a rule, this happens during periods of summer drought. One oviposition of these parasites most often contains from one to six eggs. Eggs are laid on the undersides of weed leaves, as well as on the leaves of vegetable cabbage crops, potatoes, peas, lupine, vetch, sunflower, clover, flax and beets.
The embryonic development of the gamma scoop is usually completed in 3 - 7 days, if the thermometer at the same time shows from 20 to 30 degrees, and the relative humidity does not fall below 80%.
Caterpillars of both the first and second stages are characterized by inactivity, but this is not an obstacle to their movement - they are able to move downward along the silky threads they release. Moving, such caterpillars bend in a loop. In general, their development takes from sixteen to twenty-four days, during which they have time to shed four times. Pupation of caterpillars of the last stage occurs on plants between shoots or on leaves, where they complete their nutrition and development. Depending on the meteorological conditions, the pupal stage lasts from seven to thirteen days. And the full summer development cycle of one caterpillar takes from 26 to 44 days. In the forest-steppe and steppe zones, this pest manages to develop in two generations in a year.
How to fight
The most important measure against this pest will be timely weed control. And in the fall, the soil on all the beds should be well dug up.
Butterflies of the gamut scoop can be caught by attracting them with the help of light. And against caterpillars, plants can be sprayed with such drugs as "Etaphos", "Tsimbush", "Cyanox", "Foxim", "Sumicidin", "Rovikurt", "Ripkord", "Nurell", "Anometrin", "Talkord" "Belofos" and "Ambush". Some biological products ("Dendrobacillin", "Gomelin", "Bitoxibacillin" and a number of others) also give a good effect.
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