Citrus red spider

Citrus red spider [Panonychus citri McGregor], also known as Citrus all-mite, belongs to the Arachnidae, Acarina, Aphididae.

Host and hazard characteristics: Harmful to citrus trees, yellow skin, papaya and many other fruit trees and flowers and trees, with clusters of pods, young larvae, rufidoides, young shoots, and pericarp sucking juice, causing defoliation and fruit loss, especially leaf damage. Heavy, the dense white needles on the surface of the victim's leaf are dense, and the whole leaves are gray, losing luster and finally falling off, which seriously affects the tree vigor and yield.
Morphology and habits: 4 pairs of feet, close to pear (female) or wedge (male), dark red (female) or red (male), body length 0.4 mm, width 0.24 mm (male), male ratio The female body is slightly smaller, with 10 white pairs (male) to 12 pairs (female). Three pairs of juvenile quail feet, nearly spherical body, body length 0.2 mm, light red. If they are similar to each other, they have four pairs of bodies, which are red, but more so. In South China, there are more than 20 generations in a year, and the generations overlap. Each place has its own difference due to the temperature and food conditions. The overwintering phenomenon was not evident in Guangdong, with wintering of eggs and pods in the cracks in the leaves and branches. The suitable temperature for development and reproduction is 20°C~30°C. If the overwintering population has a large number of bases and the winter and spring are warm and dry, it is an important factor for the development of this insect. In the middle of the year, serious problems occur in the spring and autumn. Natural enemies include predators, grasshoppers, and parasites.
Control methods
1, the use of natural enemies. Artificially cultivated musk vine (white flowers, 0.5 kg per acre sowing) or keep "grass method" (except for benign beekeeping weeds), implement grass cover, create good ecological conditions for the natural enemies to reproduce, to control red spider total group number.
2, according to insecticide spray treatment. When the hatching rate of overwintering eggs reaches 50%, or when spring and autumn shoots turn green, there are 100 to 200 larvae per louver, or 300 to 400 pods per louver in summer and winter shoots, and when the number of natural enemies is small, picking can be carried out or Comprehensive governance. The agent may be selected from 20% amitraz, 20% belol, 50% Torc l500-2000 times, or 20% acaricidal 600-800 times, or 73% Kete l000- 3000 times, or 20% fast ketone 4000 times, or 0.25% to 0.5% buckwheat oil, or 5% Nisolon 1500 to 2500 times. Pay attention to mixed spray and round spray, spray evenly enough to prevent drug resistance.

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