The harmfulness of jujube leaf beetle and its control methods
Jujube leaf beetle belongs to Coleoptera, Chrysomelidae. The insect harms jujube leaves and twigs with larvae and adults. In large occurrence years, the leaves are eaten up, and only jujube branches are left, which has a great impact on the yield.
The insect is in the peak period from mid-April to mid-May, and the larvae and adults are harmful to jujube leaves, twigs, buds and flowers.
Control methods: the main spray control, in the larva and adult occurrence period, spray 90% trichlorfon 1500 times or deltamethrin 15000 times to 16000 times, the general insecticidal effect is very good.
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Prevention and control of apricot gum disease in greenhouse
Apricot gum disease is a typical physiological disease, which is caused by many causes, such as hail injury, insect injury, frostbite, sunburn, mechanical trauma, etc., which is easy to cause gum disease in high grafting or branch renewal. Overpruning in summer, improper fertilization, heavy clay of soil, strong acidity, improper use of pesticides and drug damage can induce gum disease. Only by mastering the incidence law of the disease, can we achieve effective prevention and treatment. The symptoms, pathogenesis and prevention techniques are introduced as follows: symptom flow mainly occurs in
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Preparation method of preserved pear with granulated sugar
Choose pear fruits with the same shape and size, maturity of 70% to 80%, thick meat, low moisture content, no moth and mechanical damage. Peel and nucleate and boil about 3% sodium hydroxide solution. Boil the pear in a pot for 15 minutes. Remove the pear and rinse it in clean water to remove the peel. Then cut the pear in half with a fruit knife and dig out the core. Fumigated sulfur put the pear pieces into a sulfite solution containing 0.1% to 0.2% sulfur dioxide for 4 to 8 hours (if the solution concentration is high, the time is shorter). Then rinse and dry with clean water
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