Control methods of diseases and insect pests of shepherd's purse

Shepherd's purse is a common wild vegetable, because it can stir-fry, make stuffing, cook soup, delicious taste, rich nutrition, deeply loved by people, and cultivated all over the country. But in the shepherd's purse growth process will produce a variety of diseases and insect pests harm, let's take a look at the shepherd's purse disease and insect pest control methods.

1. Downy mildew

Downy mildew mainly harms the leaves of shepherd's purse, mostly in the land with high temperature and humidity and poor drainage. In addition, the environment with poor ventilation will also induce the disease. When the disease occurs, the leaves appear light green disease spots, and there is a gray-white mildew layer on the back of the diseased leaves. The leaves wither in the dry environment, while the leaves rot in the humid environment.

Control methods: reasonable rotation, not continuous cropping or adjacent cropping with cruciferous vegetables, pay attention to fertilizer and water management, increase plant ventilation and reduce the incidence of disease. When the disease occurs, it can be sprayed alternately with Ruidu manganese zinc, mancozeb, chlorothalonil and carbendazim.

2. Black spot

Black spot is also the main harm to leaves, the onset of the disease is generally the first attack outside, there are light brown or brown near-round spots, there are concentric patterns in the spots, but also long black nuances. With the development of the disease, the disease spot expanded, forming a larger dead spot, and finally led to leaf withering.

Prevention and control methods: dressing seeds with chlorothalonil or mancozeb during sowing can prevent the disease. at the initial stage of the disease, chlorothalonil, mancozeb, carbendazim, topurazine and other agents can be sprayed once every other week for 3-4 times.

3. White spot disease

White spot mainly harms leaves, similar to black spot, except that there are many gray-white round spots on the leaf surface, and the disease spot is surrounded by a yellowish halo. In the later stage of the disease, irregular dead spots are also formed. Dampness is a gray-white mildew on the back of the disease spot.

Prevention and treatment: reasonable crop rotation to reduce the incidence of the disease. Carbendazim, mancozeb, carbendazim and methyl topiramate can be sprayed every 5-7 days for 2-3 times.

4. Aphids

Both adults and larvae of aphids can be harmful, they will gather in groups on the back of the leaves, constantly sucking on the branches and leaves of the leaves, causing the leaves to yellowing, curling and deformation, and dying in severe cases. And its reproduction speed is extremely fast, a large number of secretions will pollute vegetables, so that they can not eat, resulting in greater losses.

Control methods: clean the countryside, reduce insect sources, find aphids, you can use dimethoate, chrysanthemum and horse EC, chrysanthemum EC, aphid fog and other medicament control, pay attention to alternate use, so as not to produce drug resistance.

Above are the prevention and control methods of shepherd's purse diseases and insect pests, hope to help you, want to know more related knowledge, please pay attention to us.