Chinese cabbage radish sprouts and their control

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Injury characteristics: In the leaves of the vegetables or leave the seedlings of the young shoots, leaves on the damage, resulting in shortening between the internodes, bending, young leaves down deformed curling, making the plants dwarf, affecting the heart or ball, resulting in reduced production. Victims of vegetable seedlings are unable to twitch, flower, and seed. At the same time spread viral disease, the harm caused is far greater than the harm itself.

Morphological characteristics: winged females: head, chest black, green belly. The first abdominal segment to the sixth abdomen segment each have their own marginal spots. The abdomen before and after the plaque healed. The first segment has a narrow back and middle band. The fifth segment has a small median spot. Each of the sixth to eighth segments has a transverse band. The sixth quarter is irregular. From the third to the fifth quarters, there are 21 to 29, 7 to 14 and 0 to 4 circular secondary sensory circles. Wingless female nymphs: body length 2.3 mm, width 1.3 mm, green or dark green, was thin powder. The skin is rough and has a diamond pattern. The abdomen has a long tubular shape with apex contraction and a length of 1.7 times that of the tail piece. The tail piece has 4 to 6 long hairs.

Living habits: There are more than ten generations in northern China and dozens of generations in the south. In a warm area or in a greenhouse, it is propagated throughout the year as a wingless female, with no apparent overwintering. In the north of the Yangtze River, wintering occurs on vegetables. Hunchun is hatched from March to April. After breeding on the wintering host for several generations, it will produce winged plagues that will transfer to other vegetables to expand the damage, without transforming the host's habits. In the late autumn, some of them are productive and mating lays winter. The optimum temperature for radish pods was slightly broader than that of peach pods. At lower temperatures, the radish sprouts developed rapidly (17.5 days at 9.3°C, while the peach pods required 24.5 days at 9.9°C).

Non-pollution prevention methods:

1 Strengthen forecasting. a. Investigation of the migration of winged cockroaches using yellow dish induction method. b. Investigation of the number of locusts in the field. In the field where many basic researches such as the spatial distribution type of locusts have been completed, the “zero frequency method” survey can also be used, which is more convenient. In the year or region of the locust infestation, a grading index survey method used for disease investigation may be used.

2 When the facility is cultivated, it is recommended to use insect-proof gauze, main locust-proof locust, concurrent prevention of diamondback moth, cabbage caterpillar, cabbage beetle, Spodoptera litura, cotyledon beetle, and yellow striped triceps. When the entire shed is difficult to cover, it is also effective to install an insect-proof net at the entrance or vent of the shelter.

3 Biological control: a. Control radish sprouts with fleas. b. Virulent fungal molds and smoked bees can also be used to control vegetables. c. Promote the spraying of 1.1% of the 100 parts. 楝 烟 烟 烟 烟 烟 烟 烟 1000 1000 1000 1000 1000 1000 1000 1000 1000 。 。 。 。 。 。 。 。 。 。 。 。 。 。.

4 Pharmacy control: Select as much as possible pesticides that have the triple functions of contact toxicity, internal absorption, and fumigation, such as domestic 50% hypertonic anti-influx or anti-influx, or the UK's provision of antifouling (composition is anti-inverse)50 % Wettable powder 1000 times effective. Others can use 10% imidacloprid wettable powder 1500 times, or 25% pyridine (a) 1500 times emulsion, 5% pyridine (Ma Ling) 1500 times, 50% phoxim EC. Liquid, 70 liters of liquid per 667 square meters. Stop using the drug 11 days before the harvest.

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