Control strategy of diseases and insect pests of high-quality early-bearing walnut

Control strategy of diseases and insect pests of high-quality early-bearing walnut

1 Analysis of diseases and control strategies of high-quality early-bearing walnut

1.1 Analysis of control strategies for black spot of early fruiting walnut

Black spot of early bearing walnut is mainly caused by fungi. When these fungi erode into walnut, it will cause walnut rot and cause walnut young fruit to fall off. The following two techniques are mainly used in the control of early fruit black spot of walnut: ① physical control technology, mainly to remove the fruits and branches of walnut that have been infected with black spot, so as to avoid further infection of this kind of fungi. ② agricultural control technology, in the early stage of walnut germination, the number of times of spraying stone-sulfur mixture was controlled at about 4 times. When the walnut grew to the leaf-spreading stage, Bordeaux liquid was used to spray it, so as to control the disease spot.

1.2 Analysis of control strategies for early fruiting walnut rot

As one of the common diseases of walnut, rot is mainly caused by fungal infection, and its high incidence period is about May every year. Once walnut is infected with rot, foam liquid will flow out from its branches. If the disease is serious, these liquids will appear black, resulting in the death of walnut trees. In the process of prevention and control of walnut tree rot, there are mainly three control strategies: ① agricultural control technology, that is, the managers of walnut orchards cut off the old and weak branches according to the actual situation of walnut disease. ② physical technology, once it is found that there is a walnut tree infected with rot, immediately remove the affected site. ③ pesticide prevention and control technology, first scrape out the affected part, and then spray 50% methyl thiophanate wettable powder 30-40 times liquid in the scraping position. At the same time, it can also be prevented by whitening, such as water, vegetable oil, salt, sulphur powder, quicklime, mix these substances in the proportion of 20-0.1-1-1-10, and then apply them to the trunk of the walnut.

1.3 Analysis of control strategies for anthracnose of early fruiting walnut

If the walnut is infected with anthracnose, there will be fruit drop or walnut fruit dryness, and a large number of black spots will appear on the walnut's appearance, especially when the growth environment is humid, these external black spots will slowly turn pink. In order to effectively control the anthracnose of walnut, the main way is to improve the disease resistance of walnut itself, so as to effectively resist anthracnose, such as increasing the degree of application of organic fertilizers. If the walnut has been touched by anthracnose, pesticides can be used to control it. 95% ethyl phosphor aluminum 800 times solution can be sprayed in the affected area, so as to control the disease.

2 Analysis of insect pests and control strategies of high-quality early-bearing walnut

2.1 Analysis on the control strategy of early fruiting walnut

Among the insect pests of walnut in the morning market, the limb E is a more serious pest, especially in the relatively humid growing environment, it will reproduce in large numbers, and they usually reproduce and lay eggs at night. During the day, it will perch behind the leaves of the walnut, and when it grows to the larval stage, it will enter the fruit of the walnut to invade. There are mainly the following two control measures: ① chemical control technology, using 40% sulfuric acid 200x solution or 40% chlorpyrifos 200x solution sprayed on the walnut trunk to remove the overwintering bugs on the trunk, at the same time, in the adult period, it can be used to kill the limb E, remove the black walnut and starve the insect to control it, and spray it many times according to the actual situation, so as to effectively prevent the invasion of the limb E. Artificial control technology of ②: a. It is necessary to clean up the overwintering insects on walnuts to prevent them from breeding in spring. The walnuts that have been damaged can be removed by burying or burning them.

To get rid of the insect source.

2.2 Analysis of control strategies of walnut beetle and mulberry scale

① beetles are omnivorous pests that usually grow up and lay eggs in June. The prevention and control of beetles can be carried out during this period. The first is to shake off the beetles by tapping on the trunk of walnut trees, and then collect them together and then deal with them. If there are too many beetles on walnut trees, they can be prevented and treated by chemical means. 50% phoxim EC 800 / 1000 times can be sprayed on tree trunks and branches and leaves, thus achieving the purpose of preventing and controlling beetles. ② mulberry white scale is a kind of pest that absorbs tree trunk nutrients. When there are a large number of mulberry white scale on walnut trees, it will lead to the death of walnut trees. There are usually the following ways to control mulberry white scale. It can be done by increasing the application amount of phosphorus and potassium fertilizer, cleaning up the branches and leaves of dead diseases and insects in time, pruning reasonably and so on. b. If the pest is serious, it can be controlled by killing eggs artificially. c. The related pesticides were sprayed on the branches and leaves of walnut, such as 800-fold liquid and 1000-fold solution.