For more convenient reading, I share with you the information about agricultural technology, please click on my avatar to follow me. Green onions are one of our most common vegetables, the quality of green onions is good or bad, will directly affect the commodity value of green onions, with the reduction of temperature, autumn green onions ushered in a faster growth time node, the production of green onions formed a critical period, disease and pest control should also be strengthened. When spraying pesticides, if there is a mistake in the judgment of diseases and insect pests, even if more pesticides are used, the effect on the prevention and control of onion diseases and insect pests is not great. During the growth of green onions, small white dots appear on the leaves, the leaves are dry and sharp, with the passage of time, more and more small white dots, play some fungicides, do not see how big the effect is, or even more and more, there is a rapid spread of the phenomenon. Diseases that harm the leaves, the general common leaf diseases of green onion have gray mold disease, leaf spot disease and other diseases, but the symptoms of harm are different, the onion downy mildew presents a yellowish irregular disease spot, easy to occur in the field with excessive humidity, bulk sour plum disease is a fungal disease, after spraying drugs, do not see the white spots of the leaves to improve.
The appearance of white spots on the leaves of green onions, in fact, is caused by the relatively small size of the pest thrips, the thrips are small in size, the activity is rapid, it is not easy to be observed, the thrips have a file suction tone, with a large number of pesticides used to control pests, thrips resistance to pesticides has been enhanced, and many drug control effects are not good. For example, once very effective imidacloprid, acetamiprid and other drugs, now thrips resistance to such drugs has increased exponentially, but also with the original low dose of drugs to prevent and control, the effect is not ideal. In addition, the onion leaves are different from the long style of other crops, the onion leaves are upright, cylindrically cone-shaped, with a layer of wax on the outside, do not master the spraying skills, careful spraying, the leaves can not be attached to enough liquid, for this reason, the effect of prevention and control will be greatly reduced. Horseback breeding ability is strong, from egg hatching to breeding adult insects, only two weeks to complete, thrips can occur every year can be about 10 generations, thrips are flexible, good at hiding and hiding, can prevent and control bring certain inconvenience.
Prevention and control of thrips can not simply spray a drug, to improve the method of spraying drugs in the past, some friends in the spraying of drugs when spraying from top to bottom, green onion leaves upright, the liquid is not easy to all attach to the leaves, plus there is a layer of wax on the leaves, sprayed from top to bottom, the liquid is wasted more, when spraying pesticides, choose to spray from the side, increase the leaf sticky liquid. In order to improve the adhesion of the drug, it is possible to increase the drug auxiliary, and the drug used should have a highly effective and low-toxic drug with touch killing, gastric toxicity and systemic effect. Can be used thiose amine suspension + butyl etherurea + boragedine + pesticide additives, sprayed once, and then with pyridone + enidoxazine + pesticide auxiliaries, sprayed the second time, the third time can be used bifenerate + furazine + pesticide auxiliaries, so that alternate use, can significantly reduce the resistance of thrips.
Soil application, this method is suitable for colonization when using, the use of drugs has internal absorption conduction properties, applied in the roots, through the absorption of the root system, conducted to the entire plant, play a role in insect prevention. 6 kg of biphenylthiamethiamin granules per acre of land, which can be applied to the roots along the ditch, and when controlling thrips, some pests such as maggots are also controlled. Well, today's sharing is here, welcome to pay attention, like friends to like and then go.