Ma Tianniu
Scientific name Thyestilla gebleri (Falderman) Coleoptera, Cerambycidae. Alias ​​cannabis. Widely spread the cannabis and ramie cultivation areas throughout the country, and the provinces and regions of North China, Northeast China, Inner Mongolia and Gansu Province suffered heavy damage.
Host cannabis, castor, ramie, cotton and so on.
The traits of larvae are as follows: larvae burrow into the stalks of foraging stems or adult worms to feed on ramie leaves and tender heads, affecting the growth and development of the ramie and being easily blown by the wind, affecting the yield and quality.
Morphological characteristics of female adult body length 13-18mm, male 9-13mm, thinner, darker color. All dark brown, dense gray hair. There are white lines on both sides of the prosthodontic plate and the midline, the side edges of the elytra wing, and the slit edges, which resemble sunflower seeds. Male antennae are slightly longer than body. Female antennae are slightly shorter than body and each base is grayish-white. The front chest is barrel-shaped. No thorns. The eggs are about 1.8 mm long, about 0.9 mm wide, and long oval, with a honeycomb-like surface, white colostrum, and a yellow-brown or brown color. Larvae body length 15-20mm, milky white, small head, mouthparts red-brown, large chest, back plate with small brown particles composed of "convex" shape pattern. The back of the body from the 4th to the end of each section has a pair of round protrusions, the back midline is obvious. It is about 16mm long, 6mm wide, yellowish white. There are red bristles on the proximal and posterior borders of the abdomen.
Habits are born one generation old, with mature larvae wintering in the roots of the damaged hemp plant. The disease began in early April of the following year, and phlegm was observed between May and June. The nymphs were adultated 15 days later, followed by mating and spawning. The eggs were prolific in the main stem or in the middle of the young part. Adults first bite a zig-zag-shaped wound on the main stem, and then lay 1 egg in it. Each female can produce 40 eggs. The eggs are hatched after about 1 week, and the eggs are incubated in the middle and late June and harvested in July. Enter the larval period of damage. The newly hatched larvae firstly feed under the skin, and then they enter into the pith part after licking. After gradually descending to the roots, the larvae block the wormholes with insect feces and viscous secretions for winter, and some larvae also live over the winter in the stalks.
Prevention methods (1) Autumn plowing immediately after harvesting, digging and burning roots, can effectively kill larvae and reduce the number of overwintering populations. (2) Using artificial adult death, humans are killed and adults are killed in the early morning of adulthood. (3) It is also possible to spray 90% crystal trichlorfon 900 times or 50% malathion EC and 80% dichlorvos 1500 times in the adult stage. If it can spray better in the morning.
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