What are the symptoms of wolfberry gall mites? What are the prevention and control methods of wolfbe

Gall mites are a common pest of wolfberry, harming the leaves, buds, young fruits, young stems, petals and peduncles of wolfberry. In severe cases, the whole tree becomes weak and the leaves fall off, leading to a decrease in yield. There were 15-25 kinds of galls on the severely damaged leaves, which seriously affected the yield and quality of wolfberry.

It is mainly distributed in Ningxia, Inner Mongolia, Gansu, Xinjiang, Shanxi, Shaanxi and Qinghai. Cuttings are used to raise seedlings with high-yielding and stress-resistant varieties, select robust, disease-free branches, soak them in 3000 4000 times of avermectin, and then carry out cuttings. Seedlings transported in other places are subject to strict quarantine to reduce the risk of long-distance transmission.

Strengthen fertilizer and water management, do a good job in topdressing during germination, flowering, and fruit expansion, and irrigate in time according to the principle of summer irrigation and winter irrigation, so as to enhance tree potential and improve plant stress resistance.

Combined with pruning and pruning, diseased leaves should be removed and destroyed in time to avoid migration to newly developed branches and leaves. In summer, use a shovel garden to remove overgrown branches and root tillers to prevent the growth and spread of gall mites. Goji barbarum scab, commonly known as insect bud disease, is one of the main diseases in wolfberry production.

The disease mainly harms the leaves of wolfberry, but also the shoots, flowers and fruits of wolfberry. Young mites burrow into the mesophyll of wolfberry to form galls, resulting in reduced fruit yield and poor quality. After the wolfberry is harvested, the diseased branches and leaves should be removed in time and taken away from the field for destruction.

Spring pruning should be done by late March to avoid migration of overwintering adult mites to new foliage. During the growth of wolfberry, the weedy branches and root tillers should be eradicated in time to prevent the growth and spread of gall mites.

Gall mites suck the sap of new branches and leaves, affecting growth. The white bumps on the leaves of goji berries can also affect the normal photosynthesis of the leaves, thereby reducing the fruit set rate. Even if some potted wolfberry fruits bear fruit, the fruit will dry up and cannot ripen smoothly after getting gall mites.

If the wolfberry bonsai is not treated in time, the sap in the leaves will be sucked away by a large number of gall mites, causing the leaves to dry up and even the whole plant to die. For wolfberry that is not seriously harmful to scabies and mites, spray one of the drugs every seven days, and use it two to three times in a row to remove it. For wolfberry with serious damage from scabies mites, in the case of ineffective spraying of one drug, alternate use of two or more drugs, use once every seven days, three to four times in a row, the effect will be much better.

Most of the wolfberry leaves appear yellow-green round bulges, which may be the damage of gall mites, catch the adult mites before and after wintering when a large number of gall adult mites appear in time, so as to reduce the density of pest mites.

The disease mainly damages the leaves of wolfberry, as well as the shoots, flowers and fruits of wolfberry. Young mites are used to burrow into the mesophyll of wolfberry leaves to form galls, resulting in reduced fruit yield and poor quality.

Clean the field After the wolfberry is harvested, it is necessary to remove the diseased branches and residual leaves in time and take them out of the field for destruction. Spring pruning should be completed before late March to prevent the migration of overwintering adult mites to the new foliage. During the growth period of wolfberry, it is necessary to eradicate the long branches and root tiller seedlings in time to prevent the breeding and spread of gall mites.

Symptoms: wolfberry gall mites damage wolfberry leaves, flower buds, young fruits, young stems, petals and flower stalks, flower buds can not flower and bear fruit after being damaged, the leaf surface is uneven, when the whole tree grows weakly, the fruit falls off and leaves, resulting in reduced yield, and the seriously damaged leaves have 15-25 galls, which seriously affects the yield and quality of wolfberry.

Control measures: seedling breeding. Field management: strengthen fertilizer and water management, do a good job of top dressing in germination, flowering and fruit expansion periods, in accordance with the principle of summer water irrigation, winter water irrigation, natural enemy control: the natural enemies of gall mites are seven-star ladybug, Chilean small plant mite, etc.

Chemical control.

Adult mites can suck leaves, young stems and fruits. After the leaf is damaged, purple-black nevus galls are formed, the outer edge of the front of the gall is purple ring, the center is yellow-green, the periphery is concave, the back is convex, and the gall is distributed along the leaf veins, and the base of the midrib and the middle of the lateral veins are the most densely distributed. The severely damaged leaves are twisted and deformed, and the top young leaves curl and swell into a fist-shaped, turn brown, and fall off early, resulting in bald branches and stop growing.

The young stems are damaged, and a 3 5 mm long mound gall is formed at the apical leaf bud. 1.Seedling breeding.

To use high-yield and stress-tolerant varieties for cuttings and seedlings, select branches that grow robust and free of diseases and insects, soak them in 3000 4000 times of epimectin, and then carry out cuttings. Seedlings transported from other places should be strictly quarantined to reduce the risk of long-distance transmission. 2.

Field management. Strengthen fertilizer and water management, do a good job in top dressing during germination, flowering and fruit expansion, and irrigate in time and maintain appropriate humidity in accordance with the principle of summer water irrigation and winter water irrigation, so as to enhance tree potential and improve plant stress resistance. Combined with pruning and pruning, the diseased leaves should be removed and destroyed in time, and the spring pruning should be completed before March 20 to avoid migration to new branches and leaves.

In summer, the long branches and root tillers were removed by shoveling the garden to prevent the breeding and spread of gall mites.

Symptoms: There are yellowish-green nearly round raised dots on the leaves, and in severe cases, they will turn into lilac. spraying of drugs before and after overwintering of adult mites; Dig up overcrowded plants and improve ventilation conditions; Strengthen plant quarantine work.

After wolfberry grows leaves, it is necessary to pay more attention to observation, wolfberry gall mite is a common disease of wolfberry, early detection and early **.

Goji barbarum mites: wolfberry leaves, flower buds, young fruits, young stems, petals and flower stalks can be damaged. The damaged part becomes a blue-black mole-like gall and bulges, causing bending, deformity, and discoloration, and the flower buds cannot bloom and bear fruit after being damaged.

The adult body of the gall mite is millimeter long, orange-yellow as a whole, long conical, slightly curved downward, the anterior end is thick, the cephalothorax is broad and short, protruding forward, forming a beak-shaped. Feet 2 pairs, oval spherical, milky white, transparent. Nymphs are similar to adults, but smaller in size.

Mature females overwinter in the gaps between the overwintering buds, scale buds and branches of the current and biennial branches of Lycium barbarum. In mid to late April of the following year, when the overwintering buds begin to spread their leaves, the adults migrate from the overwintering place to the new leaves to lay eggs, and after hatching, the nymphs invade the plant tissues and cause galls. In mid to late May, when the new shoots are in full bloom, the biennial branch gall mites crawl out of the gall and spread to the new shoots, and the first generation of breeding is in full bloom in early June, and the early August is the unexpected.

In mid to late August, the autumn shoots began to grow, and the gall mites moved to the autumn shoots for damage, at this time, some gall mites were harmful to the overwintering buds, and reached the second damage period in September, and all entered dormancy in mid-November. Multiple generations can occur in a year.

Control methods When the wolfberry leaves in spring, the gall mite comes out of the wintering place to spread actively, and in late May and early June, when it spreads from the old branches to the new branches, it is the two periods when the insect body is exposed to the gall, and it is also a favorable time for spraying control, and the Baumé stone sulfur mixture can be sprayed once every 7 10 days, a total of 4 times. It can also be sprayed with 50% dimethoate emulsion 1500 times, or marathon.