The genus Orthoptera is a genus of Orthoptera, which is extremely gluttonous, and both adults and nymphs can be harmful in the soil. Seeds sowed and sown, especially those that have just sprouted; the roots of the biting crops become hemp-like, causing the seedlings to die or grow poorly; the night out of the ground, biting the tender stems close to the ground, often biting the seedlings; Caused a lot of virtual soil tunnels, so that the roots of the seedlings were separated from the soil and dried up.
First, the morphological characteristics
Adult: body length 36 ~ 55 mm, yellow-brown or gray, dense and fine hair, small head, narrow and long, tentacles silky, anterior chest plate shield, with a dark red heart-shaped spot in the middle of the recess; the forefoot digging foot The inner edge of the dorsal foot sac has a spine 1 or disappears; the front wing is short, yellow-brown, and the posterior wing is longitudinally rolled into a cylindrical shape, protruding the ventral end; the abdomen end is nearly cylindrical, and the tail is slender.
Eggs: oval, yellowish brown to dark gray.
Nymphs: 13 years old, milky white to yellowish brown at initial hatching, with a gradual deepening with growth and development.
Second, the law of occurrence
In the 3rd year of the occurrence of the North China carp, the adult worms overwinter in the soil. After the second year of Qingming, the vertical ascending activities began. Afterwards, they entered the plough layer activity. At this time, the soil surface could be found not too long, and the mid-April By the end of May, surface tunnels appeared in large numbers.
In mid-to-late May, the planting of crops in spring and spring is the peak of its damage. In mid-June, it began to lay eggs in the depth of 20 to 27 cm below the soil. From late June to mid-July, it was the peak of spawning. . The newly hatched nymphs gather together, and then disperse the hazards. After the spring reaches the age of 12 to 13 years, they begin to enter the soil for the winter. In the third year, they begin to move in the spring. In the middle of August, they become adult worms. Adults do not mate in the same year, and the adults are wintering. Only mating and spawning.
Third, prevention and treatment methods
Agricultural measures
(1) Avoid applying unfertilized manure, especially horse manure.
(2) Manually digging the nest to eliminate insects and kill eggs.
2. Booby
(1) Bait trapping. 50 grams of 90% trichlorfon is heated with hot water, add 3.5 to 4 kilograms of water, sprayed on 7.5 kilograms of sauteed wheat bran, stir well, and spread it in the field in the evening.
(2) Use black light to trap and kill.
(3) Use horses and cow dung to trap and kill.
3. Chemical control
(1) Poisonous sand (soil) method. Use 50% dichlorvos emulsifiable concentrate 500ml and 2.5kg of water per acre, spray it on 100kg of dry sand with a sprayer, stir and spray to make toxic soil, and spray it on the field in the evening.
(2) Rooting. After the emergence of the seedlings, it is possible to use the 50% phoxim emulsifiable concentrate 800-1000 times solution, or 90% trichlorfon soluble powder 1000 times solution.
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