Managing autumn mulberry fields is not only related to the high yield of autumn silkworms in the year, but also related to the production of mulberry leaves in the second year of spring. The following three key links should be mastered.
Pest control and disease prevention The main diseases and pests of Jiangsu Mulberry in autumn are “four big bugs, two bugs, one diseaseâ€.
"Four big bugs" refers to mulberry, mulberry, caterpillar and wild silkworm. The mulberry in the autumn mulberry field is mainly 3-5 generations. Its larval hatching period is respectively from late July to early August, mid-August to early September, mid-September to late September, and the prevention and control strategy is “control. Three pressure four pick five." The mulberry mulberry in the autumn mulberry garden is mainly of 2 generations and 3 generations. Its larvae hatching period is respectively in late July and mid-September, and the insect pest control strategy is “Control 2 pressure 3â€. The mulberry caterpillars occur in the fall mulberry gardens in the second and third generations. The larval stages are in early August and mid-September, respectively. The wild silkworms occur in the third-generation and fourth-generation mulberry fields in autumn, and the larval stages are in early August and early September, respectively, and they can also be used as both the subject of concurrent treatment.
"Two bugs" refers to mulberry horses and red spiders. Mulberry horses are usually 5-7 generations in the autumn mulberry gardens, and their nymphs are at or around the beginning of August, August 20, and September 11. Red spiders completed about 10 generations in the fall mulberry garden. The two insects are long-standing during the high temperature and drought period, and the prevention and cure are dominated by concurrent cure.
Prevent and control the above pests, taking into account the layout of the autumn silkworm and the safety interval between drugs for silkworms. Short-term mulberry drugs have dichlorvos, phoxim, dimethoate, and acetylene sulfate; mid-term mulberry drugs include acephate and chlorpyrifos. Generally use 3 times medicine: The first time is the end of August, with 40% acephate EC (1000 times), 40% ECA (1000 times), 57% (2500 times) (Liquid) mixed sprays for comprehensive control of mulberry; the second is in early September, with 80% dichlorvos (1000 times), 50% phoxim (1000 times), and 40% dimethoate (1000) Dilution) Divide and cure; the third is in mid-September, with 80% dichlorvos EC (1000 times liquid), 50% phoxim EC (1000 times liquid) scribing treatment. The specific spraying period should be determined according to the prediction and prevention opinions of the local security and protection departments.
"A disease" refers to a bacterial sage disease, mainly black and dry type. It is easy to erupt in the summer and autumn after a typhoon, thunderstorms, sudden temperature rises, and high humidity. The better countermeasure is to improve the variety and shear. , And timely burning of diseased branches, reduce pathogens.
The rational fertilization of autumn silkworms is generally based on the late autumn silkworms in September. To ensure the growth of silkworms suitable for mature silkworms and the yield of large silkworm mulberry leaves, the last fertilizer in the year should be applied in late August, with 20 kg of urea per acre and superphosphate. Calcium 5 kg and potassium chloride 5 kg.
Scientific use of early leaves and silkworms from the bottom up to collect leaves, after the end of each mulberry branches have more than 10 leaves; late autumn silkworm to pick from the top down, after the end of each mulberry branches to keep at least 3 leaf. It is usually appropriate to have 1.2, 0.6, and 1.1 larvae per year for spring silkworms, early autumn silkworms, and late autumn silkworms. If you do not raise the early autumn silkworm, it is best to do a "cool foot", that is, in the middle of August to collect 5-7 leaves of the mulberry branches in order to facilitate the ventilation of mulberry gardens, mulberry leaf growth and improve the quality of late autumn silkworm leaves.
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