Recently, there is a lot of rain, and the weather is relatively stewed, this kind of high temperature and high humidity weather, eggplant is prone to diseases and insect pests. This stage is the high incidence of eggplant twenty-eight star ladybirds, which has an impact on the growth, quality and later marketing of eggplant. The following two recipes for the family, the effect is good, take away what you need!
Before coming out of the recipe, let's understand two aspects of the problem:
<h1 class= "pgc-h-arrow-right" > First, let's take a look at the hazard characteristics of the eggplant twenty-eight star ladybird. </h1>
The family that has grown eggplant may have been troubled by this big flower sister, which is different from other ladybugs, very easy to distinguish, and has 28 black spots on its back. This bug is very harmful, and only the stalks can eat the eggplant leaves. After harming the fruit, the flesh of the victim becomes hard, bitter, and the quality decreases, affecting the listing.
<h1 class= "pgc-h-arrow-right" > Second, what are the laws of occurrence? </h1>
The reason why the twenty-eight star ladybird is difficult to prevent is because it has migratory flight and suspended animation, and iteratively occurs, which is very difficult to control. According to the data, the eggplant twenty-eight star ladybird can occur 4 to 6 generations a year, of which 4 generations can occur in the northern region a year, and 6 generations can occur in the southern region due to the suitable temperature.
In general, adult insects will overwinter under the bark, in the crevices, in the holes, in the crevices of the soil, etc., and then begin to harm the crops in May of the next year, and the more harmful crops are potatoes and eggplants. This pest is not controlled in time, it will multiply very quickly, generally a generation occurs every month, and after the beginning of October, as the temperature drops, it begins to enter a wintering state.
Female adults will lay eggs on the back of the leaves, after 5 to 7 days can hatch into nymphs, the hatching larvae mainly harm the back of the leaves, nibbling on the leaf flesh, leaving only the upper epidermis. It seems that, like many translucent reticulated lines, pests will disperse after a little larger to harm crops.
<h1 class="pgc-h-arrow-right" > How to prevent it? </h1>
The control of eggplant twenty-eight star ladybirds must begin to control when they are nymphs, because adult insects have suspended death and migratory properties, and it is very difficult to control. It is recommended that families use the following two small recipes for control when the hatching nymphs have not yet spread:
1, optional 4.2% perchloromethyl vitamin brine emulsion 50 ml mixed with water 15 kg spray can be.
2. You can choose 15% perchlorine and urea 70 ml, mixed with 30 kg of water spray.
The above two medicinal formulas can be very good control of nymphs and adult worms of nightshade twenty-eight star ladybirds, the effect is very good, and families can try it.
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