Characteristics and control of orchid aphid disease

Many aphids (such as peach aphids). cotton aphids) can harm orchids. Aphids mainly damage young organs such as tender leaves, buds and buds. They pierce plant tissues with piercing mouthparts and absorb a large amount of sap nutrients, resulting in malnutrition of plants. Take peach aphid as an example: it is distributed all over China. Myzus persicae has 20~30 generations a year and overwinters as eggs in cold regions and wingless viviparous aphids in heart leaves of plants in warm regions. It begins to breed from April to April of the following year, and the breeding peak is from April to May. Spring drought, this insect occurrence is more serious. In November, aphids begin to lay eggs and overwinter in peach branches and cracks, and in some areas, aphids overwinter as wingless viviparous aphids on some grass flowers. Aphids parasitized on some herbaceous flowers such as chrysanthemum, tricolor and snapdragon are green in color. This insect concentrates on the young leaves to suck the juice, so that the leaf color turns yellow and the birth is delayed. The insect secretes honeydew, which can cover the surface of plants in large quantities, affecting photosynthesis. Often causes soot disease to occur. More seriously, the worm can transmit a variety of viral diseases.

Control method: In aphid season, spray 20% fenvalerate 2000 times solution, or washing powder 150 times solution. During dormancy period of peach and pear, spray 3~5 degree bomite sulfur mixture to kill eggs. For large numbers of severely damaged branches, they can be cut off and destroyed. Can use natural enemies, such as a variety of ladybugs, lacewings, eating aphid flies. The aphidids control its occurrence.