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Many summer residents know firsthand about insects that cause significant harm to vegetable plants. For example, thrips that have settled on bell peppers reduce crop yields, sometimes even causing the death of bushes.
- Thrips, what are they, how they look in the photo
- Symptoms of Infection, or Who Eats Bell Pepper Leaves
- How to prevent infection
- Processing folk remedies
- We fight thrips on bell peppers with chemicals
- How to deal with thrips on seedlings
Thrips, what are they, how they look in the photo
These insects are quite common all over the world, out of all 6000 species known to science, hundreds are herbivorous pests. The problem of controlling thrips is aggravated by their very small size, most species are from 0.05 to 0.3 cm in length, and a secretive lifestyle.
Insects reproduce actively; in a greenhouse, the population can give up to 15 generations a year. The lifespan of an individual is 25-45 days, the temperature at which the insect leads an active life and reproduces - from +15 C to +30 C.
Pests affect all types of garden ornamental plants, thrips on bell peppers, cucumbers, eggplants are often observed in an open field greenhouse, indoor flowers are not immune from them.
Thrips have an elongated body, usually 1-2 mm, a piercing-sucking mouth apparatus and thin legs with suction devices. The wings are narrow, shortened, fringed, insects fly badly. The insect develops in 5 stages, passing through the stages of egg, larva, pronymph, nymph and imago. You can view the enemy in more detail only under a magnifying glass or in a photo.
Thrips feed on plant juices, but there are species that give preference to fungi and small invertebrates. Representatives of the genus Scolotrips are classified as predators, they feed on spider mites, and the species Aelotrips prefers the larvae and eggs of herbivorous thrips species.
Some of the pest species belong to quarantine objects: they are carriers of 20 viruses that can cause plant diseases, in particular tropoviruses.
The most common pests of vegetable crops are polyphagous insects: common and onion (tobacco) insects. They are, respectively, black and dark brown, the length of the insect can reach 2 mm, i.e. you can see them with the naked eye.
Let's watch a useful video about thrips and how to deal with them:
Symptoms of Infection, or Who Eats Bell Pepper Leaves
When examining the affected plants, you should pay attention to:
- change or loss of color by leaves, their acquisition of a silvery tint;
- curvature of stems and deformation of ovaries and flowers;
- the appearance on the leaves of clearly visible necrotic spots and streaks, which merge over time.
Damaged stems are bent, flowers and ovaries are deformed. The next stage of damage is the death of damaged tissues and wilting.
Sticky leaves of pepper can also be a symptom of thrips infestation: colonies of thrips contaminate them with their secretions.
Thrips on bell pepper are very dangerous: in case of mass defeat, they can cause the death of the plant.
How to prevent infection
You can avoid the massive spread of thrips by following simple rules for caring for the beds:
- in the fall, all weeds should be removed from the beds, they can serve as a wintering place for pests;
- the soil should be carefully dug up or plowed to a depth of 25-27 cm;
- plant residues should not be allowed to be stored on the beds; they should be removed in compost heaps.
Preservation of onion and garlic planting material at room temperature leads to the reproduction of pests directly in the bulbs, after planting them in the ground, lesions are observed already in May, insects quickly spread to other vegetable crops. It is recommended to store the planting material at a temperature below + 9 C, the vital activity of thrips in such conditions ceases.
As a preventive measure, they practice attracting natural enemies of thrips to the site: ladybirds, hoverflies, lacewings.
Foliar top dressing of pepper with extracts of superphosphate or other substances that change the biochemical composition of plant tissues help prevent infection.
To prevent the spread of dangerous insects will help systematic careful inspections of plants in the beds and the rapid adoption of measures to eliminate pests.
Processing folk remedies
You can effectively fight thrips on bell peppers and other crops using folk remedies:
- spraying plants with infusion of dandelion leaves and flowers, marigolds, tomatoes, celandine, tobacco. Crushed plants are poured with water and infused for 24 hours. Spraying is carried out every week;
- spraying with a diluted extract of chopped garlic;
- processing with a decoction of onion peels (2 glasses per 10 liters of water) with the addition of liquid soap (20 g);
- planting marigolds, mint, basil along the edges of the beds with bell pepper, or in the aisles;
- mustard solution (1 tablespoon per 20 liters of water).
It will be necessary to repeat the processing of peppers infected with thrips systematically, with a break of 7-10 days.
An increase in moisture in the beds gives a good effect.
As means harmless to humans, you can use insect traps that have a bright yellow and blue color. Traps will help you quickly detect the presence of pests and reduce their numbers.
We fight thrips on bell peppers with chemicals
If the area of thrips infestation is large, or if you want to act "for sure", then you will need to use professional plant protection products. There are many insecticides designed to combat thrips. First of all, attention should be paid to systemic drugs. They provide a long protective period, their effectiveness is not reduced by precipitation.
Active substances. which are contained in the preparation penetrate into plant tissues and make it toxic to pests. At the same time, they do not have a negative impact on the development of plants. Let's consider the most effective drugs.
The drug is contact-systemic action. Has a long period of action and high resistance to washing off. It can be used for application under the roots of plants along with mineral dressings.
Actellik 500 EU from Syngenta company
Highly toxic agent, available in the form of an emulsion. Can be used in open ground, greenhouses, greenhouses. Effectively affects small insect pests, is easy to use, has a low cost.
Vertimek 018 EC from Syngenta
Insecticide of contact-intestinal action, produced in the form of an emulsion concentrate. Effective against ticks and thrips.
The property of the drug to completely cover the sheets accelerates the process of contact with pests, complete destruction occurs within 2 days. It is consumed sparingly, 1 ml of the drug is required for 1 liter of water.
Does not burn leaves.
Aktara from Syngenta Crop Protection AG, Switzerland
It belongs to low toxicity, it is able to protect crops from several types of pests for a long period. Resistant to washing off by precipitation and solar insolation. It can be folded and applied to the ground. Effective against insects living on the underside of the sheets.
Consumption rates are low, can be used as part of tank mixes. It is active at high air temperatures and low humidity.
Fitoverm from MBC Farmbiomed
The action has a contact-intestinal effect, it causes paralysis of insects and their death. When tested, the effectiveness of the drug ranged from 95 to 100%. It breaks down quickly in soil and water, does not pollute the environment. The duration of the action is from 7 to 20 days, depending on the weather. When the air temperature rises, the effectiveness of the action does not decrease. Do not mix with other plant treatments!
Systemic agents are applied 2 times a season.
But if thrips have already been found on bell peppers, then to completely get rid of them, you will need to repeat the treatment after 7-10 days. If necessary, you can carry out a third treatment at the same interval.
The funds should be used strictly in accordance with the instructions, they indicate:
- how to dilute the drug;
- what weather to process plants;
- consumption rate per 1 hundred square meters;
- permissible frequency of treatments.
Let's watch an interesting video about the fight against thrips:
How to deal with thrips on seedlings
Containers for growing seedlings and soil are disinfected by re-sowing seeds. They carefully monitor the soil moisture, and, if possible, provide air humidification.
Plants are periodically examined carefully, especially the lower part of the sheets. Other symptoms of thrips are also monitored. To enhance control, you can set up yellow and blue sticky traps in seedling containers, they are sold in flower shops.
If pests are found, insecticides should be applied, the treatment should be carried out three times, with an interval of 7 days.
Heavily infested plants may need to be removed.
Thrips on bell pepper, or any other vegetable crops are serious pests. If they are found, all possible measures should be taken to eliminate them as soon as possible.