Tobacco thrips (photo) - how to fight
Combating tobacco thrips
"Portrait" of tobacco thrips
This insect is up to 0,8-0,9 mm in size, light yellow or brown in color with a thin elongated body and narrow wings with fringe of hairs along the edges. The eggs laid by the females of this pest are small (0,25 mm long and 0.15 mm wide), whitish, kidney-shaped. Larvae are light, greenish-yellow or whitish in color, resembling adult insects in shape, but without wings and smaller than their parents.
Thrips feed on leaves, and later on onion inflorescences, sucking juice from them. From damage to the leaves appear whitish-silver spots. Feathers often bend, turn yellow and dry, and plants stop growing.
As a result, the bulbs grow small. In the testicles of the onion, the inflorescences, populated with thrips, sometimes dry out or form frail seeds that have low germination.
See also: Diseases and pests of bulbs of dahlias gladiolus and cannabis
Thrips lay eggs in leaf tissue
One female during their lifetime produces them up to 100 pieces. After 3-6 days, larvae feeding on the leaves juice leave the eggs. The development of one generation of insects in the southern regions goes from 14 to 30 days. In more northern regions and in cool weather, the development of thrips slows down.
By the time of harvesting the onions, if the weather is still warm, thrips fly to other plants: cucumber, cabbage, weeds, where they are before leaving for wintering. Some of the insects are taken under dry onion scales and end up in storage. Onion sets, which are stored in a warm way - at a temperature of 18-20 degrees Celsius - thrips
live and reproduce throughout the winter. In the bulbs they are between dry and fleshy scales, in connection with which the surface of succulent scales, in comparison with the dry ones, has the appearance of a retina-wrinkled with light silvery spots. The quality of the bulbs of sowing and queen cells decreases.
Reference by topic: Ticks - pests of fruit and ornamental plants: fighting with them
How to deal with thrips
In order to defeat the pest, first of all, it is necessary to apply agrotechnical control measures: the post-harvest residues should be destroyed and the bed on which the thrips are "managed" should be deeply dug.
Before planting, the onion should be placed in hot water {45 degrees) for 10 min, followed by cooling in cold water.
Chemical plant protection measures can also be applied. An exception is the onion bed, where plants are grown on a feather. First of all, it is recommended to use the new drug BI-58. You can also use broad-spectrum insecticides: "Inta-Vir" and "Iskra" (1 tablet per 10 liters of water). Treatments must be repeated after 5-7 days due to the fact that some of the pests are in the soil or in the egg stage.
© Author: Nikolay Petrovich Borisenok, agronomist, Brest
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Thrips are small insects of dark brown or black color, which bring a lot of trouble to gardeners.
The thrips settle on the leaves of plants and feed on their juice. As a result, the upper part of the leaf acquires a silvery sheen, and on the lower part dark spots appear. Then the leaves fall off. Insects can also settle in flowers and buds.
To combat thrips, the affected plants are sprayed with cold water several times a day. A good result is spraying with infusions of garlic or pyrethrum, as well as with a solution of nicotine or anabasine sulfate with the addition of a soap solution (4 g of soap, 2 tsp of the drug - per 10 liters of water).
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Often, tobacco thrips can be found on cucumbers, if they grow next to onions. Bow -
one of the favorite habitats of this pest, and, in order not to attract him again, it is better to make a cucumber bed further away from onion.
Larvae of tobacco thrips are very small and almost transparent, but it is easy to find them on the cucumber tops. First, the affected leaf is covered with dark yellow spots, begins to wither and curl. Secondly, if you look at the inside of the sheet, you can find a whole horde of these pests. The larvae of thrips feed on the juice of the leaves, which causes the plants to weaken and may even die. After active growth, larvae burrow into the ground, and then fly out in the form of adults with wings.
To prevent tobacco thrips from reigning in borage, it is important not to allow moisture deficiency. Tryps very much likes dry air and does not tolerate humidity at all. In late autumn, the land on the cucumber bed should be digged to a depth of 20 cm. The larvae of the thrips will be on the surface and freeze.
The pest can also be controlled mechanically, tearing and burning affected cucumber leaves. Spraying onion infusions at the rate of 2 liter cans of husks per 4 liters of water is also effective - insist on the day, add another 5 liters of water and shavings of laundry soap. This solution is harmless to cucumbers, but harmful to thrips.
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Thrips that feed on tomatoes and cucumbers growing in a greenhouse or open ground leave characteristic traces: discolored areas (pricks) and excrement in the appearance of black dots (tiny brown drops). In this case, the leaf blades are twisted, and the plants slow down growth and development. And to protect tomatoes from these pests should be approached with all thoroughness.
The insects themselves are very small, like the smallest flies. Without going into the subtleties of taxonomy, I will describe the important features of their biology. Adult thrips overwinter in the soil at a depth of 4-7 cm. In May they come to the surface and begin to feed on plants. The female lays eggs; within 25 days she can lay up to 100 eggs. It is almost impossible to distinguish larvae from adult insects with the naked eye. Thrips feed on the entire surface of the plant, but their bulk is concentrated in the lower tier. And depending on environmental conditions, from 5 to 8 generations of the pest can develop per season.
As for protection measures, the main thing here is strict adherence to agricultural technology, so that plants can tolerate thrips nutrition with the least harm to themselves. Even and sufficient watering is very important. Attacks as one of the thrips' favorite crops, onions, should be planted as far away from tomatoes as possible.
A simple and effective means of controlling thrips is the placement of glue traps for flies in the immediate vicinity of plants. Such a measure will allow not only timely fixing the beginning of thrips flight, but also limiting their number.
There are also chemical means of plant protection, with the most effective biological insecticides of intestinal contact action. They spray plants and soil.
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Last spring, new, seemingly healthy bulbs of freesia did not work, but immediately landed in a pot and left to germinate in the warmth. Soon on many indoor plants appeared tripe. Selectively spilled soil in pots and sprinkled the leaves with Tanrek. But the wrecker did not disappear. The collection is large, some plants are "not transportable", the room is residential. How to deal with thrips?
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These insects are difficult to detect: they are small, mobile, hide in the sinuses and on the underside of the leaf, in the bulbous ones - among the scales. The larvae of the thrips may also live in the upper layer of the soil. The pest is resistant to treatments, so it is advisable to use systemic pesticides. You need to carefully inspect all the plants. Strongly affected will be required (if they can be carried out in non-residential premises) complex treatment: spraying and shedding of soil substratum. The leaves are treated with a contact pesticide, for example, "Akarin" or "Phyto-Verm". As a system I recommend the preparations of Aktar, Confidor, Biotlin, Commander, Iskra Zolotaya (also in the form of soil sticks), Tanrek. They are bred in water, according to the instructions, and water the plants under the root.
SOLUTION spills the entire collection, except for plants, the fruits of which are used for food (for example, lemons).
The systemic drug is used once, but if necessary, the treatment can be repeated in 3 weeks, changing the pesticide.