Detailed explanation of control techniques of four major insect pests in jujube

1. Control of jujube inchworm

Jujube inchworm is also called jujube Buqu. The larvae do harm to buds, leaves and buds, and when serious, they often cause two times of germination. Prevention and control methods:

1. Biological control. The protection of natural enemies is the main channel of biological control. With jujube inchworm larvae as host, the parasitism rate of mature larvae is 30% and 50%, which is hosted by swollen tarsal wasp, silkworm, silkworm and Caiyan wide forehead. Attention should be paid to protection.

2. Chemical control. Spraying 1500 times 25% diflubenzuron 3 or 2000 times 20% fenozide solution twice before the 3rd instar of the larvae, or spraying 20% butyl EC 2000 times, 2.5% green Kung Fu EC 3000 times, etc., can effectively eliminate the harm of jujube inchworm larvae.

2. Control of peach heart borer

Peach heart borer is also called heart borer. The larvae mainly endanger the jujube fruit, the larvae eat around the jujube kernel in the jujube fruit, and the insect dung is left in the fruit, showing a "bean paste filling". Early damage caused fruit drop, and later caused pest fruit, which seriously affected the yield and quality of red jujube. Prevention and control methods:

1. Biological control. There are several kinds of parasitic wasps of peach heart borer, especially the parasitic rate of peach early-bellied cocoon wasp and Chinese tooth-legged wasp is higher. The cocoon wasp laid eggs in peach eggs and parasitized as larvae in peach larvae. When peach overwintering larvae were unearthed as cocoons, they were eaten up. Therefore, peach parasitoids can be released during the peak period of overgeneration adults. In the early incubation period of the larvae, the peach was killed by spraying bacterial pesticide (BT emulsion). Peach sex attractants can also be used to trap and kill adults during the overwintering generation.

2. Chemical control. Spread poisonous soil: use 15% Lexben granule 2kg or 50% phoxim EC 500g and fine soil 15kg 25kg per mu, sprinkle evenly on the ground under the tree trunk, mix and flatten the soil with hand rake. Lexben should be used once, and phoxim should be applied 2 or 3 times in a row. Spray on the ground: spray the ground with 48% Lesbon EC 300 times 500 times, spray the ground before the overwintering larvae are unearthed, and rake the surface. Tree control: the suitable period for control is the initial hatching period of larvae. Spraying 48% Lexben EC 1000-1500 times has a strong contact effect on eggs and newly hatched larvae; it can also spray 20% fenvalerate EC 2000 times, or 10% cypermethrin EC 1500 times. A good control effect can be achieved by spraying it again after a week.

3. Control of jujube armyworm

The scientific name of the jujube armyworm is the jujube falx wing small roll moth. In the stage of sprouting and leaf expansion, it harms the tender buds and leaves, resulting in two times of sprouting; in the flowering stage, it breaks the flower stalk and harms the flower buds; in the young fruit stage, it eats the young fruit, resulting in fruit drop; in the fruit expansion stage, the larvae stick jujube leaves and fruits together and eat the fruit, causing a large number of insect pests. Prevention and control methods:

1. Biological control. In the growing period of jujube, especially in the flowering and fruiting period, in order to solve the drug damage and residue and protect the natural enemies and pollinating insects, it can be solved by releasing Trichogramma and using biological pesticides. In the egg stage of the second and third generation of jujube armyworm, 3000 Trichogramma wasps were released from each strain, and the parasitism rate was about 85%. Spraying biological pesticides cyanobacteria and borer-killing bacilli 100-200 times, the control effect of larvae reached 70%-90%.

2. Chemical control. When the tender shoot of jujube tree grows to about 3 cm (that is, the peak hatching period of the first generation larvae), it is the key period for chemical control. Use 2.5% deltamethrin EC 4000 times, 20% fenvalerate EC 3000 times, etc.

IV. Control of red spiders

It mainly harms the leaves and young parts of jujube, when the leaves are withered and yellow, the leaves and fruits fall early. Generally, high temperature and drought are easy to occur. Prevention and control methods:

1. Biological control. There are many kinds of natural enemies of red spiders, including Chrysopus sinensis, mite-eating ladybugs and predatory mites, especially Chrysopus chinensis population, which preys on jujube red spiders. Protecting and increasing the number of natural enemies can enhance its control effect on jujube red spider population.

2. Chemical control. The ideal control effect can be achieved by using mite dangerous 4000 × solution, 15% miridine EC 2000 times, 1.8% azithromycin EC 60008000 times, etc.