Cotton cotton field horse

Scientific name Frankliniella intonsa (Trybom) Thysanoptera, Thripidae. Alias ​​Taiwan Hummer. Synonyms Frankliniella formosae Moulton. Distributed throughout the country.

Host cotton, sugar cane, rice, beans and a variety of vegetables.

Damage characteristics Before the leaves of cotton seedlings were born, the top victims became black and withered, and the cotyledons became fat and became headless. Soon it died. After the emergence of the true leaves, the top victims suffered from the formation of leafy cotton and the buds were greatly reduced. Cotyledons are silver-white patches when they are victimized, and severe dry coke shrinks. After the damage to the true leaves, yellow patches appeared, and severe coking was broken.

Morphological characteristics Adult body approximately 1.3mm long, brownish-brown, yellow-brown head and chest; antennae thick, the third section is 2.5 times wider and has a transverse ridge in the first half; the head is shorter than the chest, the back The wrinkles on the back are thick, and the cheeks are contracted on both sides. The front edge of the head is flat between the two compound eyes, and only slightly protrudes in the center. The fore wings are wider and shorter, with 20 to 21 frontal veins, 14 to 16 posterior veins, and 8 abdominal segments. The back edge of the back comb is complete, with fine hairs on the teeth; the head, chest, wing veins and abdomen are thick and dark. The second instar larvae have a body length of about 1 mm, a yellow base color, compound eye reds, 7 antennae, the longest in sections 3 and 4, and a wavy ring pattern in section 3. Section 4 has a ring arrangement of micro loops; The back of the abdomen was slightly rounded and blunt at the tip of the body; the posterior edge of the ninth abdominal segment had clear circles of microdentate teeth.

Life habits occur in the south of China in the 11th to 14th generations, with adult wintering. Adults tend to flower, eggs are mostly produced in flower organs, such as petals, filaments, flower film, pedicel, usually produced in the petals. Each female lays about 180 eggs. Spawning period lasts 20-50 days. In early spring, the main damage is in the broad bean flowers, and the cotton seedlings are damaged after they are unearthed and moved into the cotton fields. May-June is the height of damage.

Prevention methods (1) In the early spring before the host on the prevention of cotton seedlings unearthed in the broad bean, onion, garlic spray insecticide, a preventive and control, can reduce the insect mouth, reduce migration to the cotton field. (2) Agricultural control In the winter and spring, the weeds at the edge of the field are eradicated timely, and the combination of splitting and seedlings eliminates headless cotton and multi-head cotton. (3) Chemical seed dressing l00kg cotton seed with 20% lindane powder or 75% formazan EC 1kg, 25-50kg of water seed dressing, can effectively control the seedlings of Thrips, and treat underground pests. (4) 100 seedlings with 15-30 insects or three true leaves, 10 insects, 4 true leaves, 100 insects, 20-30 insects, spraying 50% phoxim or 5% Ruijin Special Suspension, 35% Phosphorus-containing EC 1500x, 44% Quick Cascade 1000x, 10% Distilled EC 2000x 1.8% Abelmycin 4000x, 35% SAID 2000 times liquid. In addition, 2.5% can be used to obtain EC 2000-2500 times or 10% imidacloprid WP 2000 times, 10% DK WP active ingredient per 667m2, 2%, 44% Pesticide 30ml water 60k8 spray .