Скачать или смотреть How to control thrips on cotton | thrips | thirps attack on cotton | thrips control | thrips disease

Thrips are tiny, slender insects less than 0.06 inch (1.55 mm) long. Western flower thrips are by far the most common thrips on cotton and may be found all season. They are light colored; adults have clear, slender wings. The bean thrips occasionally appear on cotton in summer, usually at field edges. Immature bean thrips have orange or red spots at either side on the end of their abdomen; adults are usually dark with white bands on their wings.
Thrips cause most damage to seedling cotton. They rasp tender leaves and terminal buds with their sharp mouthparts and feed on the juices. Leaves may turn brown on the edges, develop a silvery color, or become distorted and curl upward. Light thrips infestations tend to delay plant growth and retard maturity. Heavy infestations may kill terminal buds or even entire plants. Damaged terminal buds cause abnormal branching patterns. The duration and intensity of thrips infestations vary greatly according to season and geographic location.
Once cotton plants are four to six weeks old, they outgrow thrips damage and recover.
Scouting for thrips can be quite difficult. However, it is important to catch significant populations before economic damage occurs. Start looking for thrips ,as soon as, plants begin to emerge, especially in the newest growth. Work on hands and knees. Shake plants over a piece of white paper. If you see small, slender objects crawling, these are usually thrips. If there is residue of sand or soil on the plants, the thrips will be more difficult to see. Windy conditions require pulling some plants, placing them in a plastic bag, taking them out of the wind and examining the plants for thrips in the terminals and on the underside of the first two leaves. Look for early signs of damage. Thrips feeding in the terminal tissue make new leaves appear ratty.

Populations above 1 thrips per true leaf up to the 6 leaf stage may justify treatment, depending on growing conditions. Control is rarely necessary later in the season.

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