We fight with thrips!
Tryps is one of the most common pests of ornamental, agricultural and indoor crops. In the conditions of large greenhouse farms it is almost impossible to destroy thrips. In the best case, their numbers are held back at a level that would not affect the marketable properties of the products (flowers, or fruits).
- Features of thrips as plant pests
- The nature of the defeat of plants by thrips
- Ways to deal with thrips
Features of thrips as plant pests
Thrips, or bubbly (Lat. Thysanoptera) - small insects common on all continents. About 2000 species belonging to more than one hundred genera are known. In the post-Soviet space, there are more than 300 species.
The body of thrips is elongated, length from 0.5 to 14 mm (usually 1-2 mm). Mouth organs of piercing-sucking type. The legs of most species are slender, running. The paws have a tooth and a suction vesicular device. Development takes place as follows: egg, larva, pronymph, nymph, imago. Larvae and nymphs have several ages.
The coloring of adult insects is inconspicuous: black, gray and brown colors predominate. Larvae of thrips are white-yellow, grayish.
Identification of thrips species is difficult due to their small size and intraspecific variability. The most common are variegated, decorative, dracenic, rosé, tobacco, onion and some other types of thrips.
Several hundred species of small herbivorous thrips are now considered very dangerous pests of cultivated plants. They suck juice from leaves, flowers and fruits, carry viruses, and pollute plants with their secretions. Many types of thrips are characterized by a hidden lifestyle and group development of larvae. Thrips can only be on one plant among a whole group, so it is difficult to detect the first foci of their appearance.
The nature of the defeat of plants by thrips
Larvae and adult thrips suck out cell sap from plant tissue. Initially, this causes the appearance of yellow or discolored spots, stripes or a peculiar streak; gradually these strokes and spots merge. Damaged plant tissue dies, holes form as a result; leaves fade and fall. Flowers lose their decorative effect and fall prematurely.
During mass colonization on plants, “silver” patches are visible, stalk bending is often noted. Damage to flower buds causes deformation of the flowers. Traces of thrips show traces of excrement.
Thrips are also dangerous in that they are carriers of dangerous plant diseases. Most thrips are polyphages, that is, they damage almost all plants.
Excessive dryness of the air in the room or greenhouse must be avoided. It is recommended to periodically arrange shower plants.
Regularly inspect the flowers and leaves of plants. On the underside of the leaf you can see light (white-yellow or grayish) wingless thrips larvae, which, nevertheless, are able to move very quickly. You can also find adults, a nondescript brownish or yellowish color, sometimes with transverse stripes.
Adhesive traps - blue or yellow stripes of paper hanging among plants - help not only to detect this pest in time, but also to reduce its number.
Important: thrips are easily moved from the affected plant to healthy ones standing nearby.
Ways to deal with thrips
Thrips are especially resistant pests! They breed very quickly - at optimal temperatures for them (and for many species this is just the room temperature - + 20 ... + 25 ° C) they can double their numbers in 4-6 days.
If thrips is found on plants, it is necessary to examine adjacent plants, since thrips are easily moved to neighboring plants.
If possible, it is better to isolate the affected plants from healthy ones. Carry the plants very carefully: when shaking the transferred plants, thrips larvae and adults easily fall from the leaves and can wait a long time to settle on the plants again.
The place where the plants affected by thrips stood should be thoroughly cleaned and the topmost layer of the soil mixture in pots should be removed from the plants treated with the preparations.
Before treatment with an insecticide, wash the plant in the shower. If at the moment you do not have an insecticide, then you can wash the plant with a sponge with laundry soap, however, this is a temporary measure, and it does not provide the removal of thrips.
Thrips control chemicals
- Fitoverm: dissolve 2ml in 200 ml of water. To spray the affected plant with the resulting solution, after spraying, put a transparent plastic bag on the plant, it can be removed in a day.
- Vertimek: dissolve 2.5 ml of the drug in 10 l of water. To spray the affected plant with the resulting solution, after spraying, put on the plant a transparent plastic bag, the bag can be removed in a day.
- Agravertine: consumption rate: 5 ml per 0.5 l of water. At temperatures below +18 degrees, it penetrates poorly into plant tissues. To spray the affected plant with the resulting solution, after spraying, put on the plant a transparent plastic bag, the bag can be removed in a day.
- Actelik: dissolve an ampoule in 1 liter of water (has a very pungent odor). To spray the affected plant with the resulting solution, after spraying, put on the plant a transparent plastic bag, the bag can be removed in a day.
- Karate: consumption rate: 0.5 ml per 2.5 liters of water (in an ampoule of 2 ml).
- Confidor: the solution must not be sprayed, but spilled on the substrate of the infected plant.
- Karbofos: consumption rate: 15 g per 2 liters. water (packs of 60 and 30 grams).
- Intavir: consumption rate: 1 tablet dissolved in 10 liters. water. To spray the affected plant with the resulting solution, after spraying, put on the plant a transparent plastic bag, the bag can be removed in a day.
Processing should be done at least twice with an interval of 7-10 days, as larvae gradually hatch from eggs laid in the leaves of the egg.
Folk remedies against thrips
Various folk remedies help with a small lesion of the plant with thrips, but if the lesion is massive, then it is necessary to apply various systemic insecticides that penetrate the plant and act through the plant tissue on thrips.
Decoctions are used: creeping mustard, Sarepta mustard, chilli pepper, real tobacco, yarrow, large celandine.
In addition to insecticides in the fight against thrips, predatory mites can be used: Amblyseius cucumeris, Amblyseius barken, Amblyseius degenerans, predatory bugs Orius laevigatus, Orius majusculus.