Therefore, adding a little pepper to your daily menu is of great benefit to your health.
However, in the process of pepper planting, the appearance of this mite seriously affected the healthy growth of pepper and the income of farmers' uncles.
So, what are the symptoms of the harm of mites? Do you know the occurrence characteristics? What preventive measures are there? Harmful symptoms of Phytophthora capsici: Phytophthora capsici mainly harms peppers, but also vegetables such as eggplant, tomato, kidney bean, cowpea, cucumber and bitter gourd.
I like to collect the back of young leaves to absorb juice. The back of the injured leaf is brown, soaked in oil, hard and brittle, and curled to the back of the leaf, which looks like a dog's ear, so it is called "pepper dog's ear" and "oil tip".
It is difficult for damaged plants to grow new branches, and the pericarp becomes hard, which has a great impact on yield, and even no harvest in severe cases.
Occurrence characteristics of pepper tarsal mite: it occurs for many generations a year, and in some places it reaches more than 20 generations.
In the wild, it mainly depends on the wind to spread over a long distance, and it can also crawl at close range.
Parthenogenesis is also possible, but the hatching rate of unfertilized eggs is low.
Eggs are mostly laid on the back of leaves, the depression of young fruits and the buds.
Like warm and humid environmental conditions, the suitable temperature for development and reproduction is 15-30℃ and the relative humidity is 80-90%, which is very harmful.
Adult mites are lively and tend to be immature.
When the feeding part is old, it will immediately move to a new tender part.
When the temperature is higher than 35℃, the hatching rate of eggs decreases, and the mortality of young mites and adults is extremely high.
Therefore, the occurrence of drought and high temperature in the field is light.
In plastic greenhouses, generally, the symptoms of injury began to appear in the middle and late April, and the peak period of injury was from the middle and late May to August, and the peak period of pepper rust appeared in June-July.
Under the condition of open field, the symptoms of damage began to appear in the middle and late May, and the peak period was from late June to September.
Prevention and control methods of pepper mite: 1, weeds and residual plants in fields and fields should be well controlled in winter protection areas to eliminate overwintering insect sources; 2. The layout is reasonable.
The rotation of pepper and non-eggplant vegetables can be separated by 2-3 years, and the effect of paddy-upland rotation is better.
3. Suitable control period and chemicals: Tartars have a short life cycle and strong reproduction, so special attention should be paid to early control.
1 medication time: plastic greenhouse in the middle and late April; Pay attention to the field inspection in the middle and late May. At this time, the insect plant rate is 65,438+00% and the leaf-rolling plant rate is 2%, or spray it at the beginning of flowering, and then spray it 65,438+0 times every 65,438+00-65,438+05 days for three consecutive times.
When spraying, focus on the tender parts of the upper part of the plant.
The following agents can be selected: 1.8% avermectin EC, 5% hexythiazox EC 2000 times and 20% pyridaben EC 2000 times; The above is the information about pepper mites provided by Bian Xiao. I hope the above information can help you.