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Occurrence of Cotton Mites and Comprehensive Control Measures
Cotton cricket, commonly known as oil juice, tired insects, dense insects, etc., is an important pest of cotton. In the past, it was only harmed during the seedling stage of cotton, and it entered the self-destruction in July. Since the 1970s, there have been reports of "Fuxi" harming disasters in the cotton areas. The so-called "Fuxi" refers to the population that the seedlings that remain in late June are multiplying during the fuze period. The occurrence of cottonseed meal has seriously affected the yield and quality of cotton. First, form recognition 1. Dry mother: body length of about 62 mm, width of about 1.07 mm, the whole dark green, antennae 5, about half the body length. 2. Wingless female embryo: body length 1.5 to 1.9 mm, width 0.65 to 0.86 mm, the body has yellow, blue, dark green, dark green and other colors. Antennae are approximately 1/2 of body length or slightly longer than 1/2. In the sixth quarter, the whip is about four times as much as the minister, and the circle of feeling is born in the fifth and sixth quarters. The compound eye is dark red. The belly tube is black or cyan, 0.2-0.27 mm long, thick and cylindrical, with a slightly wider base. 3. Winged fetuses: body 1.2 to 1.9 mm, width 0.45 to 0.62 mm, body yellow, light green or dark green. The tentacles are shorter than the body. There are five to eight sensory circles in the third quarter, lined up. The whip in the sixth quarter is three times that of the minister. 4. Wingless spawning females: body length 1.28 ~ 1.4 mm, width of about 0.5 ~ 0.6 mm, five sections of antennae, sensory circle was born in four or five sections, hind leg section is thick, there are irregularly arranged on the sensory circle Dozens. 5. Winged male dragonfly: body length 1.28 ~ 1.4 mm, width of about 0.5 ~ 0.6 mm, antennae six sections, sensory circle born in three, four, five, six sections. 6. Eggs: orange at the beginning of production, dark brown at the end, and turned black in paint and oval in 6 days. 7. Wingless: If the young nymph antennae are six, the body color is yellowish in summer, and the body color is grayish yellow in autumn. The white and round sides of the abdomen on the back of the first and sixth sections and the sides of the section and the sides of the section have white circles. One spot. 8. If there are wings, if the shape is the same as the wings, if there is a wing in the second age, the latter half of the wings is grayish yellow. Second, the damage symptoms are generally harmed on the back of the leaf blade and pierced into the cotton leaf epidermis for feeding. After injury, the leaves are curled backwards, the plants shrink, and the growth is slow; the cotton seedlings are vulnerable in the period of 1 to 3 leaves, which will affect the development of new leaves in severe cases; the resistance of cotton seedlings will be enhanced after the 4th leaf stage, even if the leaves are wounded. Restoration; fruiting branches are not stretched when the victim suffers serious damage; young buds fall off in large numbers. Third, the characteristics of cotton aphid in the March to April in the winter host on the hatching, propagation of 2 to 3 generations, until the emergence of cotton, Huanghuai area from about late April to early May, the generation of winged owl, moved by the wintering host Fly to homeowner's cotton. After a large number of breedings, due to the increase of population, the food material deteriorated, and a large number of winged maggots appeared. From late May to early June, when the cotton began to bud, a second migration took place in the cotton field, spreading; in the middle of July, the positive The value of cotton blossoms is at its peak, and the third spread in the cotton field; the fourth migration is the wintering of the host from the cotton field. IV. Comprehensive prevention and control measures 1. Agricultural control Spray omethoate on overwintering hosts in early spring to eradicate maggots on overwintering hosts; implement interplanting of cotton and wheat, sowing or grounding in cotton fields to plant spring corn, sorghum, rape, etc.; attract natural enemies to control Cotton field locusts; in the intervening, Dingmiao, pruning, hiccups, to the old leaves, should be removed more than cotton plants, brought to the field stacking. 2. Chemical seed dressing Cotton seeds are first hot-sanded 30 times in warm water of “three open and one coolâ€, and then they are stopped for a while, and then 3 kg of carbofuran microparticles are used to formulate 6 kg of 1.5 kg mixed cotton seed per acre. 3. Liquid topping with 40% of monocrotophos EC or 50% of methamidophos EC, 40% of omethoate EC 150 to 200 times liquid per acre with good liquid 1 to 1.5 kg, with a sprayer in the cotton seedlings At the top of the heart 3 to 5 centimeters high drop heart 1 second species, so that liquid medicine like snow-capped top drop spray in the heart of cotton seedlings can be. 4. The liquid coating stem: use 40% monocrotophos or 50% methamidophos EC 20 ml, sesbania powder 1 g or polyvinyl alcohol 2 g, dilute in 100 ml, stir in the adult phase. Coated in the red and green cotton border, dot 1 ~ 2 cm long drug tape, seedlings coated with wheat size drug spots, should not ring, the general efficacy of up to 7 to 10 days. 5. Miao Miao: Before 3 true leaves, the rolling leaf rate is 5 to 10%, 4 true leaf leaves are 10 to 20%, and Fuxi leafing rate is 5 to 10%, or the average plant top. , Central and lower 3-leaf pods 150-200, timely spraying 35% Saitan oil 1500-times or 44% Profenofos 1500-fold, 40%, anti-lingbo oil 1200-fold, 43% chlorofluorone Cyanide 1500 times liquid, 90% faster Soluble soluble powder 3500 times, 20% of good anti-winter emulsion to prevent Fuxi 1000 times, 2000 times seedling locust can be. 6. Other methods of prevention and control 1 Biological control: Artificially assisted floating insects at the seedling stage, with floating treatment of earthworms, to make the ratio below 1:150. 2 Yellow plate inducement: When cotton aphids migrate to cotton seedlings, the yellow plates coated with waste machine oil in the cotton fields can trap a large number of winged pupae, delaying the peaks of field aphids and reducing the damage. Author: Agronomy Specialty Group, Qingyuan Vocational Education Center, Baoding City, Hebei Province