The Latest Control Methods for Common Pests and Diseases of Snow Peas
Snow peas, which are what we commonly call peas, do not have high requirements for the growing environment. They can be planted on field ridges, on balconies, or in fields, so many people now grow a few snow peas at home. But when snow peas develop diseases, people are at a loss. So today Qinnongwang has brought everyone a treat, which is to teach everyone the control methods for some of the more common pests and diseases of snow peas. Let's take a look below.
1. Powdery mildew
Powdery mildew generally occurs during the podding period of snow peas and the stage after podding, so it has a great impact on the yield of snow peas. The initial symptoms of powdery mildew are a small number of pale spots appearing on the leaf surface and stems of snow peas. If no prevention is taken, you will find that the white spots on the leaf surface slowly spread and cover the entire leaf surface, and the same happens on the stems. In the end, this causes the plant to wither and then die. If pods are already set on the vines at this time, the quality of the pods is also very poor. So the ordinary control method is to arrange a reasonable density at planting time, and secondly to set up supports to maintain good air permeability. During the disease period, we can spray with chlorothalonil solution, once every five to ten days, for three to four consecutive times.
2. Brown spot disease
The early symptoms of brown spot disease are also mainly reflected on the leaf surface of snow peas. At first, brown spots of various sizes appear on the leaf surface, and then when you touch them with your hand, you will find that your hand is covered with dark brown powder. Finally, the entire leaf surface is replaced by black spots. There are generally two control methods. One is through ecological means, that is, reasonable fertilization, not applying excessive nitrogen fertilizer, and secondly, promptly draining water from the field, cleaning up debris in the field, and regularly carrying out intertillage and weeding. Another is to use chemical agents for control. We generally use a 1:1:200 Bordeaux mixture or a 75% chlorothalonil wettable powder 500-600 times solution sprayed on the leaf surface for control.
3. Root rot
The period when root rot most often occurs is during the seedling stage of snow peas. Generally, the disease is most severe when snow peas grow to about ten cm. This disease usually appears in the plum rain season, or when there is relatively high rainfall. It is caused by bacterial infection, and it mainly harms the roots of the plant, causing the entire plant to lose water and die at the root. First, we can choose varieties with better resistance. Second, during field management, observe weather changes one by one and respond promptly. When diseased plants are found, promptly remove the plants and clean the soil thoroughly, then spread a layer of quicklime for disinfection, so as to avoid infecting other normally growing seedlings. Finally, chemical control methods are used, applying metalaxyl-hymexazol or copper formulations as a root drench, or spraying with carbendazim.
4. Aphids
Aphids are also a relatively common pest of snow peas. They mainly harm the tender shoots of snow peas and hinder the growth of snow peas. We can buy some traps specifically for aphids to trap and kill them. Second, we can also make trapping tools ourselves according to the preferences of aphids. Finally, use imidacloprid for control.
5. Pod borers
Pod borers are a very annoying pest. They mainly feed on the flower buds and tender pods of snow peas, which causes snow peas to drop pods and leaves bite marks all over the pods. Such snow peas have no value at all. So when there are relatively few pod borers, we directly catch and kill them by hand, and remove the damaged pods. Then we can spray an appropriate amount of imidacloprid or dimethoate emulsifiable solution.