Hello farmers in today's headlines! Today we talk about common diseases and pests of crops and the prevention and control of small insects. Here I will mainly talk about three representative insects, aphids, thrips and red spiders. Others such as ticks, leafhoppers and the like, because the main crop growing areas in China are not particularly representative at present, so they will not be elaborated in this article, and the follow-up will be targeted according to the needs of farmers.
Today, let's talk about aphids, aphids on many crops in May and June are very fierce, so let's start with it!
<h1>Characteristics and habits of aphids</h1>
At present, there are many aphids, there are thousands of species, but we may only have 5 to 6 common species, namely astragalus, red aphid, black aphid, which is divided by its color. But all aphids have a commonality, aphids it looks a lot like wax sculptures made of beeswax, and the adult aphids are very beautiful (I have a heavier taste), provided that it doesn't harm your crops (of course this is not possible).
Let's first talk about the habits of aphids, aphids reproduce 10 to 20 generations a year, that is to say, it reproduces very quickly, it is mainly in the spring shoots and buds, as well as on the young leaves. In April to June and September to October of each year, it is the peak of its two seizures.
The suitable temperature for aphid reproduction is 24-27 ° C, which means that the spring and autumn seasons are the peak period of its attack, like the summer from July to August, because the temperature is relatively high, which is not conducive to its growth.
Aphids are sucking mouthpieces, what is a sucking mouthpiece? Everyone knows mosquitoes, and mosquitoes live by sucking our blood. An aphid is very similar to a mosquito, it sucks the sap on the crop to survive. Therefore, the harm of aphids is to suck the sap on the new shoots and young leaves, so that the young leaves of the new shoots curl and shrink, shorten the internodes, and when the young shoots are severe, they wilt, causing the young fruits to fall off, and a large number of new shoots cannot be extracted, not only the yield is reduced that year, but also a large number of flowers and fruits, and it is possible to sterilize.
In addition, the excrement of aphids is the main cause of this soot disease, if you see a large area of soot on the fruit tree, it means that you are likely to need to fight aphids. In addition to making the tree body unsightly, it also affects the photosynthesis of the crop, affects the respiration of the crop, and causes the growth of the crop to be blocked to a certain extent.
In addition, aphids are also one of the important causes of citrus recession disease and various transmissible diseases, and the characteristics of our aphids here are basically similar.
<h1>Aphid control methods</h1>
Let's talk about the control of aphids. First of all, I will talk about chemical control, for example, the current farmers, if the aphids have occurred, at the beginning because the aphids are relatively small, you may not pay attention to it, and when it happens, you must take medicine, so here I will first talk about chemical control, that is, how to spray medicine.
What is recommended here is to use 20% of the furazine 2000 times, or 30% of the thiazinone 2000 times, twice in a row, with an interval of about a week.
Secondly, there are actually many ways to control aphids, in addition to chemical control, there are physical control and biological control.
What is biological control? There are several kinds of biological control, the first to introduce natural enemies, such as ladybugs, aphid cocoon bees, aphid wasps, which can prey on aphids and reduce the survival base of aphids, but this is not realistic for individual farmers.
But the following biological control method, may be everyone can use, that is, the use of aphid information hormone to booby trap, the aphid information hormone in a plastic bottle, hanging in the garden, place a basin below, the aphid to lure the aphid into the water, kill the aphid.
In addition, aphids also have a way of control is physical control, one of the physical control methods is to use silver-gray plastic strips, the plastic strips are hung in the orchard, because the aphids have a characteristic, avoidance, it does not like silver light, you hang on the silver plastic strips, you can prevent aphids from entering the garden.
In addition, the yellow armyworm board is used to control aphids, which you may also see in other orchards, and we just do it.
Speaking of this today, this period is a high incidence of aphid harm, we must not ignore it! Next article Let's talk more about the problem of red spiders.