The Latest Technical Methods for Hazelnut Pest and Disease Control

Hazelnuts are one of the most common dried fruits in our lives, and they are also the dried fruit most used for processing, such as liqueur-filled nut kernels and the like. Moreover, the hazelnut tree also has value as a fuelwood forest and is widely used to improve land suitable for afforestation, although the current scope of artificial cultivation is still not very wide. But as the country pays more and more attention to desert afforestation work, the role of the hazelnut tree is becoming greater and greater. However, when planting hazelnut trees, many pests and diseases are often encountered. So what pests and diseases can hazelnut trees have? How should they be dealt with? Let's take a look together!

1. Hazelnut powdery mildew

Symptoms: Hazelnut powdery mildew, also known as hazelnut powdery mildew and abbreviated as powdery mildew, generally occurs on hazelnut trees planted in Northeast China. Powdery mildew mainly harms the leaves, but it may also harm twigs, young buds and husks. After the leaves are infected, unclear yellow patches appear on the leaves, and soon white powder appears at the patches; then the patches begin to slowly extend and expand, and many patches join together into sheets. They also gradually lose green, slowly turn yellow, become distorted and scorched, and finally lead to early defoliation. For young leaves, it mainly prevents them from unfolding, and white powder also appears on the twigs, along with cracking.

Control methods: Once disease symptoms are found, the diseased branches and leaves of the diseased plants should be removed immediately. If the diseased plant is a central plant, it should be cut down entirely in time to reduce the source of infection. Carry out appropriate thinning of branches to enhance air permeability and the disease resistance of the tree body, and spray triadimefon for prevention.

2. Scarab beetles

Damage symptoms: Scarab beetles are the most common pests of all plants, and they belong to the pest family Scarabaeidae in the order Coleoptera. The main ones that harm hazelnut trees include the Oriental scarab beetle and the apple hairy scarab beetle, among others. Adult scarab beetles gnaw on the young leaves and leaves of the tree body. Adults generally lay eggs in the soil. After the eggs hatch underground, the larvae begin to gnaw on the roots of the tree body, hindering the tree's absorption of nutrients and seriously affecting tree development.

Control methods: First, implement crop rotation and rotational grazing planting techniques, and it is not suitable to grow them continuously. Select disease-resistant seeds, soak the seeds for disinfection before planting, use bagging techniques, plow and disinfect the soil, and create a mixed forest. It is also possible to release an appropriate amount of Beauveria bassiana, attract ground wasps, and attract birds to bring in the natural enemies of scarab beetles. Scarab beetles have a state of feigning death, and they generally feign death on the tree trunk. You can shake the tree body to make the scarab beetles fall off and carry out manual capture. Finally, chemical capture can also be carried out using pesticides such as insecticides.

3. Hazelnut weevil

Damage symptoms: Weevils mainly harm wild hazelnut forests. Although they occur less often in artificially planted hazelnut forests, everyone still must not let down their guard. Adult weevils bore into and feed on young buds and leaf branches, causing the young buds to be incomplete, the leaves to be covered with pinprick-like holes, and the branches to be hollowed out and very easy to break, affecting the growth of new shoots. They also extend their slender head tubes into young fruits, causing the young fruits and young embryos to stop growing and developing, resulting in early fruit drop. They also excrete feces into the fruits.

Control methods: During the supplementary nutrition period before adult oviposition and the early stage of oviposition, use a high-concentration D-M mixture to poison and kill the adults, then carry out a comprehensive treatment and disinfection of the hazelnut forest, spraying about three times, with an interval of half a month each time.

The above are the pests and diseases that often appear when planting hazelnuts. Everyone must pay attention to the sanitation and disinfection of the orchard. Most causes of disease are caused by improper orchard management. Although the disease incidence rate of hazelnuts is not high, this does not mean they will not develop diseases. Diseases deal a fatal blow to hazelnuts. If not dealt with in time, they will lead to a large reduction in hazelnut yield or even total crop failure, causing incalculable losses to farmers.