What about grape leaf worms?

Grape is one of the oldest fruit tree species in the world. Grape fossils were found in Tertiary strata, indicating that grapes were widely distributed in Europe, Asia and Greenland at that time. The taste of grapes is very delicious. Under the cultivation of artificial technology, grapes can be bought all the year round. Although grapes taste delicious, growing grapes is not an easy task, so what about grape leaf worms?

I. Prevention and control of grape leaf insects

All stages of grape growth and development can be harmed by a variety of pests, resulting in the decline of quality and yield. There are more than 300 kinds of grape pests, and there are more than 10 kinds of common and serious pests. The main pests of piercing mouthparts that invade buds and leaves are grape spot leafhopper, green bug bug, tobacco thrips and so on. The most common leaf-eating pests of chewable mouthparts are grape armyworm and beetle, which cause tender shoots wilting and leaves withering and falling early. When there are insects in grape leaves, it is necessary to determine the types of pests as soon as possible and prescribe the right medicine to the case.

Grape spotted leafhopper generally uses nymphs and adults to suck the sap of new shoots and tender leaves of plants. When the population density is high, there are often small white spots on the leaf surface, which makes the leaves wither ahead of time, which has a great impact on the appearance and fruit production. The main control methods are removing weeds, falling leaves and turning over the ground to eliminate overwintering insects in winter.) In summer, strengthen cultivation management, timely picking, pruning, ploughing, weeding, managing secondary shoots, and maintain good scenery conditions. Commonly used pesticides are 2000 times spray, such as 80% dichlorvos EC, 50% phoxim EC, 50% malathion EC, 50% fenitrothion EC and so on.

The adults and nymphs of the green bug bug damage the terminal bud, paracentric and tender leaves of the plant, affecting the normal growth, and the leaves are broken. The control method is to remove Penny weeds and other miscellaneous trees around the vineyard. Avoid intercropping green leaves, taproots and other vegetables in the vineyard. In rainy season, pay attention to trench drainage, mid-ploughing and weeding to reduce the humidity in the garden. Commonly used drugs are 35% Sedan EC, 10% imidacloprid wettable powder, 10% EC, 20% methomyl EC 2000 times, and so on.

The adults of tobacco thrips mostly move, feed and lay eggs on the opposite side of the tender leaves of the upper part of the host. Nymphs mostly feed on both sides of leaf veins, resulting in silver-gray markings. The main control methods are to remove weeds and fallen leaves from orchards in winter and spring, and to eliminate thrips from September to October and early spring in order to reduce the source of insects. The chemical control is to spray 2000 times solution of imidacloprid wettable powder in early spring, or 3000 times emulsion of 1.8% imidacloprid EC, or 1500 times solution of 0.12% Tianli II (insecticidal) wettable powder.

The grape diamondback moth does not eat the eggshell after hatching, which is more than the main vein on the back of the leaf or perches on the petiole. when the damage is more serious, it often eats up the leaves. The control method is combined with grape buried in winter and unearthed in spring to remove overwintering pupae. Combined with summer pruning and other management work, looking for the form of damage and ground insect droppings to capture larvae. The method of chemical control is to spray trichlorfon, dichlorvos, parathion and other agents with common concentration.

Beetles mainly damage the buds, young leaves and flower buds of the plants. the injured parts are missing or incomplete, and will be eaten up in serious cases. The control methods are to investigate and grasp the peak period of adult occurrence, take measures and control in time. Generally, 50% phoxim EC is 200 kg 250 grams per mu, and 10 times of water is sprayed on 25 kg fine soil to make poisonous soil. or use 50% phoxim, 50% parathion or 20% isomaliphate with water and seeds according to the ratio of 1% phoxim, 50% parathion or 20% isomaliphate to water and seeds Chemical control is to use 3.5% fluoronitrile ·bromine EC 90~l20ml/ mu, 40% chloro ·octyl EC 250ml/ mu and other drugs to irrigate roots, each plant irrigated with 150~250ml.

The above are the main pests that harm grape leaves and the means of control. When carrying out prevention and control, we must give priority to prevention and control in time.