Identification and Control of Myzus persicae
The damage of peach aphid is very widespread. Adults and nymphs cluster to absorb juice on the back of leaves and young shoots, and the damaged leaves curl irregularly to the back, which affects the growth of new shoots of peach trees and spreads the virus. Peach aphids can do harm to more than 300 species of plants, which is one of the most difficult insect pests to control.
Winged viviparous female aphids are green and yellowish green; brown and reddish brown, with different colors due to different hosts; wingless viviparous female aphids are green, yellowish green, apricot yellow and reddish brown; nymphs are small and light red; eggs are mostly laid in the gaps of branches, bud axils and branchlets of the host, which are oblong and lacquer black. More than 10 or even 20 generations occur in a year. The eggs overwintered in the shoots, axils, twigs and crevices of the peach tree, the peach buds germinated to the flowering stage, the overwintering eggs hatched, the nymphs began to harm the peach buds, the new shoots produced 1-3 cm in late April, the temperature increased, and the aphids developed rapidly, reaching the peak from late May to early June, and then a large number of winged aphids appeared. after mid-June, winged aphids migrated to summer hosts, and winged aphids were produced in mid-October. Move back to the peach tree, mate and lay eggs over the winter.
Prevention and control methods:
1. Natural enemies are used to control aphids, ladybugs, lacewings, parasitic wasps, etc., but aphids multiply quickly and in large quantities, so it is difficult to control them by natural enemies.
two。 Chemical control can be used to control lice aphid, Aktai, aphid spray and other chemical spray control. Pay attention to the spray to be fine, heavy and uniform in order to achieve good results.
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Jinling long jujube
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Cultivation period and method of Taiwan Indian jujube
The first period is usually planted in February-March (the frost-free area in the south can be planted earlier in December-February), the survival rate is high, the growth is good, and can blossom and bear fruit in the same year. After the fruit was harvested in the following year, the fine varieties were grafted from February to March. (2) the appropriate dense planting density can be as follows: (1) 3m × 4m ·666.7m ~ 2 55 plants, (2) 3m × 5m × 5m ~ 2 666.7m ~ 2 44 plants, and after 3 years, it can be changed into 6m × 4m and 6m × 5m. (3) the implementation of mixed or inter-planting factors
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