The Damage and Prevention of Peach Aphids

I. Species of Peach Aphids

1 peach

Occurrence of 10-30 generations in one year, wintering with eggs in the shoots, buds, shoots and branches of peach trees. In the early spring of the following year, the peach buds germinate till the flowering stage. The eggs begin to hatch, cluster on buds, and suck juice. In late March, shepherds will begin to reproduce. After the new shoots are unfolded, the cluster leaves are damaged. The victim leaves curled to the back. Excretion of mucus, pollution of shoots, leaf surface of tobacco mold, inhibition of shoot growth, causing leaves. After several generations of breeding, the number of animals increased to the heaviest level by May, and began to produce winged maggots. It flew to tobacco and vegetables and continued to breed.

2 Peach meal

More than 20 generations occurred in 1 year. The eggs were overwintered in peach branches and bud seams and hatched in March-April. After the leaves were damaged, they were curled to the back side, and the leaves were thickened and the color turned yellow. They were covered with a lot of self-powder and caused fallen leaves. From May to June, the fastest breeding, the most serious harm.

3 peach tumor

More than 10 generations occurred in 1 year and wintered on the peach trees. In the middle and late March of the following year, the peaches began to hatch after germination, and in May and June they were the most dangerous.

Second, the harm of peach aphids

The period from late April to May is the period of infestation, and from May to June, the two locusts will fly to other crops and grasses. After the peach tree was damaged, the leaves were pale and curled, which affected the photosynthesis. When the peach trees were seriously damaged, the leaves fell off, which affected the yield and flower bud formation and weakened the tree vigor. The predominant species of aphid natural enemies is ladybugs, which are dominated by proboscis ladybirds, heterochromatic ladybirds, and seven-spot ladybirds. Other natural enemies include grasshoppers, food fly flies, cocoons, and spiders.

Planting overwintering crops such as broad beans and alfalfa in the open spaces around Taoyuan and in the fall will create a diverse ecological environment for plants and help the natural enemies pass through the winter. These crops are generally harmed by locusts in the early spring and provide food for the ladybugs that emerge from the spring.

Third, the occurrence of peach aphids

The occurrence of peach aphids is closely related to temperature, humidity and tree nutrient status. In general, warm winter, warm spring and early spring, and even rainy year are conducive to great occurrence, and high temperature and high humidity are not conducive to its occurrence. Too much nitrogen fertilizer or poor growth of peach trees is beneficial to the occurrence of aphids.

Four, peach aphid prevention and control methods

1 Strengthen Orchard Management

Combine the spring pruning, cut the victim's shoots, and burn them together.

2 reasonable supporting cultivation

It is not appropriate to plant crops such as tobacco and cabbage in or near Taoyuan in order to reduce the summer breeding sites of locusts.

3 Protect natural enemies

Ladybugs, hoverfly, grass barley, and parasitoids are the natural enemies of mites. They should spray as few broad-spectrum pesticides as possible, and avoid spraying pesticides when there are many natural enemies.

4 drug application

Use a brush to apply a 6 cm wide insecticide ring around the main body, and then wrap it in paper or plastic cloth. The drug efficacy period is about 15 days.

5 Spraying pesticides

After the egg hatched in spring, when the peach tree was reddish and after flowering, single-use or compound preparations were sprayed alternately with beta-cypermethrin, imidacloprid, acetamiprid, and spirotetramat. Peach whitefly can be added to the liquid detergent liquid detergent to increase adhesion, remove wax powder on the body.

6 yellow traps

Peach pods have yellowing potential and can be hung yellow or painted with butter and oil to trap and kill.

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