Yesterday, a farmer who planted eggplant sent a message for help, which roughly means that he has only planted for more than ten days the eggplant seedling leaves have problems, and the new shoots of the seedlings can not grow, and not only is it the first time to encounter this situation, last year is the same situation, want to ask what is the cause of the cause, the help message also comes with several photos of eggplant seedlings with symptoms. From the photos sent by this farmer, it can be seen that the leaf color of the eggplant seedlings is somewhat abnormal, the leaf edge is also somewhat curly, from the symptoms, it should be that the tea yellow mite infestation has occurred, and then analyzed from the time point, now in August is the peak of the tea yellow mite, so it can be determined that the eggplant planted by the farmer has a tea yellow mite infestation.
Tea yellow mite is also known as tea young leaf mite, broad body mite, etc., and many farmers like to call it a white spider, it is also one of the more serious pests of vegetable crops, especially its food is more mixed, the host crop is as many as 70 kinds, many farmers who grow vegetables are also deeply affected, and eggplant, cucumber, tomato, pepper and other melons, beans and other vegetables are its main harm objects, and when the tea yellow mite infestation occurs seriously, it will make the entire plant dry and die, the harm is very large. The eggplant planted by this farmer is still in the seedling stage, and if it is not controlled in time, it will inevitably cause very large losses after the insect infestation is serious. Today, let's analyze in detail the tea yellow mites that harm the growth of eggplant and effective prevention and control measures, hoping to help this anxious farmer and hope to bring real help to other farmers.
The photographs provided by the farmers can be seen that there are symptoms of tea mites
< h1 class="pgc-h-arrow-right" > what are the abnormal manifestations of eggplant plants after the occurrence of tea yellow mite infestation? </h1>
The harm of tea yellow mites to eggplant mainly comes from young mites and adult mites, and when harming eggplant plants, it is mainly to suck the sap of the young shoots, young leaves, flowers, young fruits and other young parts of the eggplant, especially the buds and leaves and flower utensils of the eggplant that have not yet unfolded. When the leaves are invaded by tea mites, the diseased leaves will appear thicker and smaller, narrower symptoms, and the color of the leaves after the injury will also change, especially the back of the leaves will become oily brown, and the leaf margins will also curl downwards, which is also the main symptom characteristics of judging the harm of tea yellow mites; when the young stems are damaged, the young stems will become brown, and there will be a phenomenon of clumps or baldness; when the fruit is damaged, it will become brown, and the surface of the fruit will become rough, just like the blossoming of the bun; in addition, The buds of eggplant become deformed after being damaged, while the plants appear dwarfed. It should be noted that because the size of the tea mite is very small, it is difficult to find its presence with the eyes, and after the occurrence of tea yellow mite infestation, the abnormal symptoms of the eggplant plant are very similar to the viral disease, so when the tea yellow mite infestation occurs, many farmers will mistakenly judge the virus disease, thus delaying the best insect control period.
Eggplant plants and fruits (left) and fruits (right) harmed by tea mites
<h1 class="pgc-h-arrow-right" >what factors are involved in the occurrence of tea yellow mites? </h1>
If you want to effectively prevent the occurrence of tea mites, it is essential to understand the factors that occur, because only by knowing its habits can we prevent and control its habits.
Time factor: In fact, the occurrence of any pest is most directly related to time, pests are like crops, have their fixed growth cycle. The same is true of tea yellow mites, generally in the winter the harm of tea yellow mites is relatively light, on the protective ground, there will be traces of tea yellow mites in March, April to June will occur more seriously; and on the open ground, tea yellow mites will appear in late April, from July to September is the peak period of tea yellow mites, these three months are also the most serious period of tea yellow mites, so it is necessary to take more precautions.
Eggplant leaves after being harmed by tea yellow mites
Environmental factors: In addition to time factors, environmental factors also affect the occurrence of tea yellow mite infestations, and different environments also lead to different habits of tea yellow mites. For example, on the open ground, tea mites can occur more than 20 generations a year, while on protected land, they occur annually. In addition, the warm and humid environment is also very popular with tea yellow mite larvae, in this environment the occurrence of insect infestation is also more serious, especially in the continuous cloudy days and weak sunshine weather environment, especially when the temperature is 16 ° C ~ 27 ° C, humidity in 45% ~ 90%, tea yellow mite infestation is very easy to break out.
Growth habits and transmission routes: Tea yellow mites generally lay eggs on the back of the leaves of eggplant leaves and on the depressions and shoots of the fruit, and the incubation period takes only 2 to 3 days, while the larval stage is also 2 to 3 days, which shows that its growth is very fast. Adult insects overwinter in the cracks in the soil, on winter plants and overhangs, and the adults are more active, spreading mainly through autonomous crawling and wind and field farming.
Plants after the occurrence of tea yellow mite infestation in the field
<h1 class = "pgc-h-arrow-right" > tea yellow mite infestation is serious, and the combination of control and control avoids outbreaks of insect pests</h1>
Because tea yellow mites occur in dozens of generations a year, so the frequency and extent of its harm can be imagined, for very harmful tea yellow mites, farmers should take timely control measures to avoid the outbreak of insect pests.
1. Agricultural control
Agricultural prevention and control generally starts from strengthening the management of the field, especially for the physiological habits of tea yellow mites, in the cultivation process of eggplant, we must pay attention to the ventilation and light transmittance of the field, avoid the growth of eggplant plants, control the relative humidity of the field, and do not provide a suitable growth environment for tea yellow mites, which can effectively reduce its degree of harm. In addition, it is necessary to keep the field environment clean, especially to eradicate weeds in the field and on the edge of the field, and remove the residual leaves in the field to eliminate or reduce the source of insects in the field. In the peak period of tea yellow mites, the plants in the field should be inspected frequently, if the damaged plants are found, they should be controlled in time, and if the leaf curl rate in the field reaches 0.5%, then it is necessary to spray for control.
2. Use their natural enemies for prevention and control
The use of natural enemies of insect pests to control insect pests is a very commonly used control measure, and the natural enemy of tea mites is plant mites, which can be artificially released into the field, so that the use of plant mites can effectively control the outbreak of tea yellow mites. It should be noted that if this method is used, the use of agents that are more lethal to their natural enemies should be avoided when spraying.
3. Chemical control
Chemical control is mainly based on fumigation and spraying. The fumigation method is generally used in the cultivation of eggplant in protected areas, and it can be mixed with 80% of the dichlorvos emulsion 3 ml with dry sawdust per square meter of shed, and then sealed and smoked for 16 hours to effectively achieve the effect of insecticidal. Pharmaceutical control is the main control method, especially in the initial flowering stage of eggplant and the early stage of insect infestation, spray control, spray once a week, spray three times in a row. When spraying, it is necessary to pay attention to the spraying of young tissues such as young leaves, young stems and young fruits in the upper part of the plant, and the agent should be rotated.
Commonly used agents are: acaricide emulsion, alkyne mite emulsion, thiazone emulsion, acaricide wettable powder, trichlorocarbicide emulsion and so on.
Summary: The harm of insect pests to eggplant is no less than the harm caused by diseases, and now it has entered the late August, which is in the peak of tea yellow mites, and once the insect infestation breaks out, it will cause great harm to the growth of eggplant plants and subsequent harvests. Therefore, farmers should understand its growth habits and the law of occurrence, timely take comprehensive control measures combined with prevention and control, and also avoid the problem of confusing the harm of tea yellow mites with viral diseases and other physiological diseases and misdiagnosing them, grasp the harmful symptoms after their occurrence, judge from many aspects of the symptoms, avoid misdiagnosis and delay the best control period, only in this way can the harm caused by insect pests be reduced.
This article is original by agricultural technology acrobatics, welcome to pay attention, take you along with long knowledge!