Peach aphid is a well-known pest, among the nearly 4,000 species of aphids that have been named in the Aphid family, peach aphid is the most important species, which harms 352 plants in more than 50 families.
Peach aphids have a short life cycle, a large amount of reproduction, in addition to sucking the sap of plants, they can also secrete honeydew, causing coal pollution disease and affecting the normal growth of plants; more importantly, spreading a variety of plant viruses.
Peach aphids can harm almost any greenhouse plant in the greenhouse, so it has the common name of greenhouse aphid.
Peach aphid occurs in Korea, Japan, Indonesia, India, North America, Europe, Africa and other places, and is one of the most widely distributed aphids in the world. It is distributed and occurs throughout our country.
About 20 species of aphids in the world have developed resistance. However, there are only 3 types of drug resistance with the longest history and the deepest impact. Peach aphids are one of them.
for harm
Peach aphids are plagued by nymphs and adults clustering new shoots and young leaves, sucking sap from the tree, and the affected leaves are curled and wrinkled, which seriously affects the growth of the tree; the affected fruit is uneven, affecting the growth of the fruit and the appearance quality of the fruit. In addition to direct harm, the honeydew excreted by aphids will breed mold, cause coal pollution, and affect the quality of the fruit and the value of the product.
Peach aphid hazards (Photo taken at Zhengzhou Institute of Pomology/2016-3-5)
The unevenness of the affected fruit affects the appearance and quality of the fruit (Photo taken at Zhengzhou Fruit Research Institute/2016-5-15)
Regularity of occurrence
Peach aphids occur in the Central Plains for more than 20 generations a year, overwintering in the axils of peach buds with eggs. The next year, when the flower buds expand and emerge red, they begin to hatch and become harmful to the flower buds, gradually shifting to the back of the leaves as the leaves stretch and grow.
Wintering eggs of peach aphids
Photographed on 2016-3-5, Zhengzhou Institute of Pomology
As the number of aphids multiplies increases, the pest gradually increases, with the most severe damage in mid-to-late May. At the beginning of June, winged aphids gradually developed and began to migrate to vegetables, tobacco, weeds and other pests. By October, winged aphids fly back to the peach orchards, produce sexual aphids on the peach trees, and after mating, lay eggs in the bud axils and other parts of the winter.
Photographed on 2016-3-29, Zhengzhou Institute of Pomology
Prevention and control methods
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Biocontrol
Here emphasis is placed on the identification and protection of natural enemies: Taoyuan aphids have more types of natural enemies, common and large numbers, and the main control ability is grass aphids, aphids, ladybirds and aphid cocoon bees, etc. These natural enemies are mostly all metamorphosed insects, and fruit growers should be able to identify and pay attention to protection. When using chemicals, care should be taken to choose agents that are safe for natural enemies to protect natural enemies such as grasshoppers, aphid-eating flies, and ladybirds.
Grasshopper larvae
Grasshoppers are adults
Aphid-eating larvae are preying on aphids
Aphid-eating fly larvae
Gourd larva
Ladybird adult (just feathered)
>>>> chemical control
Chemical control of peach aphid pays attention to grasping the control period and key nodes. Generally, 3 doses can be used to control the damage of peach aphids.
When the first drug is used when the flower buds are enlarged and red, the second dose can be used after the flower, and then according to the degree of aphid occurrence, the interval is 20-25 days, and the drug is used 1 to 2 times before the leaf curl.
The agent can be selected with flufenamitrile, imidacloprid, acetamiprid, and avermectin.