Pest control methods of pear net bug
This insect, also known as military worms, gathers the dorsal thorns and suck juice in the leaves of adults and nymphs, so that the affected leaves are densely covered with white spots, and even the whole leaves are pale, causing early defoliation, affecting tree development and flower bud formation, and in serious cases, blooming twice in the autumn of the same year, causing damage to the yield of the second year. This insect has miscellaneous feeding habits and can harm many kinds of fruit trees, such as pear, apple, scarlet, begonia, peach, cherry, Hawthorn, jujube and so on.
[occurrence regularity] there are 4-5 generations a year. The overwintering adults began to lay eggs in mid-April, and the egg period was 10-15 days. The first generation nymphs occurred one after another in early May and flourished in the middle of May. The later generations of nymphs appeared in mid-late June, early-middle August and early-mid-September, and the adults migrated and overwintered from mid-late October. The occurrence algebra of this insect is more, the host of each generation is complex, and the phenomenon of co-overlap in the field is serious. The long-term dry weather is beneficial to the reproduction of this insect.
[control methods] (1) thoroughly sweep the litter and weeds in the garden in winter, burn them centrally and eliminate the overwintering adults. (2) if you master the situation of insects, you will cure them early. ① pays close attention to overwintering generation control, and soil disinfection is carried out in late March or early April before overwintering adults are active, which has a significant effect on killing overwintering adults. The nymphs of each generation of ② should be sprayed in time at the initial stage of nymph occurrence, especially the initial stage of the third and fourth generation nymphs. The agent can be used with 80% dichlorvos emulsion 8-1000 times, or 50% parathion emulsion 1000 times, or 20% fenvalerate emulsion 2000 times, preferably 2-3 times continuously. When spraying, pay attention to encirclement and annihilation, avoid leakage, and act at the same time to prevent relocation.
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Taocang Fang Zaosheng
The Japanese variety, Cangfang Yingzang, was bred in 1945 by crossing (Taskang × white peach) with real species (insoluble precocious varieties). It was named in 1951. It was introduced into China in 1966. The fruit is round, symmetrical, the top of the fruit is flat; the average weight of a single fruit is 127g, and the maximum weight is 206g; the pericarp is milky white, with dark red spots or halos on the sunny side, which is not easy to peel off; the milky white pulp is slightly reddish, hard soluble, sweet and fragrant; soluble solids 12.0%. Sticky core.
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Production technology of seedless jujube
1. Raw materials: 50kg dried red jujube, 30kg cotton sugar, 100g citric acid. two。 Operation points: (1). A milky white jujube with large nucleus, small meat and thick skin was selected and processed according to three grades: big, medium and small. (2)。 Grind one end of the iron pipe with a diameter of 6mm to 8mm, stick it in from one end of the jujube, and take out the jujube core when it is pulled out. During continuous operation, the jujube core is constantly ejected from the other end of the iron pipe. (3)。 Soak the enucleated dates in clean water for 12 hours.
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