Licorice bean elephant
Morphological features: adult oval, brown or dark brown, body length 2.5-3mm, width 1.5-1.8mm; antennae wide and short, serrated, less than the base of the sheath wing. The forechest dorsal plate is dotted and densely light brown hairy, and the posterior margin is as wide as the sheath wing. Sheath wing cloth scratched, densely light brown hairy. The buttocks are long, the ends are slightly pointed, and the ventral surface is covered with dense beige hair. There is a small protuberance near the inner edge of the posterior leg, a long tooth at the inner end of the posterior tibial segment, and the longest first segment of the posterior tarsal.
Harmful crop: licorice
Damage symptoms: mainly eat licorice seeds after harvest. The worm decay rate of untreated new seeds can reach 35% after overwintering, and that of seeds stored for 2 years is more than 70%.
Taxonomic attribute: Coleoptera
The characteristics of the disease: one generation occurs every year, and the larvae overwinter in the pods of stored licorice seeds and field licorice seedlings. Eclosion began in the middle of May in the second year, and adults could be seen in the field from late May to late September, and the field population density was the highest in early August. The adults lay eggs in the growing pods, and the larvae develop in the seed pods after hatching and overwintering with the seeds in the warehouse or in the pods in the field. Adults can feed on licorice leaves, and larvae mainly damage stored licorice seeds.
Control method: completely cut off the wild licorice seedlings in and around the planting garden in autumn. The podding period was sprayed with 1000 times of 90% trichlorfon crystal and 2000 times of 20% deltamethrin EC. Licorice seed pods can be fumigated with aluminum phosphide when stored in the warehouse after harvesting and threshing, and it is best to store them in large quantities with sealed oxygen and nitrogen. The storage should be checked regularly and fumigated with aluminum phosphide for once.
Commonly used agents; trichlorfon 20% deltamethrin EC
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High-yield cultivation techniques of licorice
Licorice alias sweet grass root, sweet licorice, sweet root, powder grass and so on. It is a perennial herb of the genus Glycyrrhiza Leguminosae, which is used in medicine with roots and rhizomes. It has the functions of clearing heat and detoxification, moistening the lung and dispelling talk, tonifying the spleen and qi, relieving cough and resolving phlegm, and reconciling various medicines. For detoxification of sore, cough and sore, weakness of spleen and stomach, deficiency of qi and lack of blood, cold, stomachache, limb pain, jaundice, periodontal disease and so on. In addition, Glycyrrhiza uralensis, Glycyrrhiza uralensis and Glycyrrhiza yunnanensis are also used as licorice. Gan
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Seed treatment method of Glycyrrhiza uralensis-soaking seed in warm Soup
Soak the seeds in warm water of 60 ℃ and keep stirring. When the water temperature drops, remove the seeds and soak them in clear water until they expand, remove and drain, and then sow. After soaking seeds in warm soup, the germination rate of seeds can be increased by 15% to 20%. The seeds soaked in 60 ℃ warm water for 4 hours can also be removed and placed in a warm place, covered with a wet cloth, drenched with clean water twice a day, and sown when the seeds crack.
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