How to control wheat aphid more scientifically
Wheat aphid is a kind of pest which has the largest area and the most serious damage all the year round. Despite the perennial damage of wheat aphids, there are still some misunderstandings in the control of wheat aphids. How to control wheat aphid more scientifically? It is suggested that attention should be paid to the following three points:
First, the appropriate time to start prevention and control. In general years, the appropriate period for the control of wheat aphids (when the number of aphids per hundred plants rises to 500) is after wheat flowering (before grain filling), usually around May 5. It is best to start prevention and control during this period. As long as the drug is used in the right way and the dosage meets the requirements, the harm can be solved by one prevention and treatment.
Second, the time of the end of prevention and control. From years of control experience, 20 days before wheat ripening (late filling stage or early wax ripening stage), that is, May 25. A few days ago, spraying should be stopped to control wheat aphids. In this period, even if the number of aphids is large, but at this time various environmental conditions are no longer suitable for the occurrence of wheat aphids, without control, the number of wheat aphids will decline rapidly.
Third, the choice of prevention and control agents. At present, there are three ideal agents to control wheat aphid: imidacloprid, acetamiprid and aldicarb. When selecting the control agents of wheat aphid, the three pesticides should be used alternately. It should be noted that many pesticide products now have a variety of trade names, when buying to make sure that the active ingredient on the label is one of imidacloprid, acetamiprid or aldicarb. Matrine is a botanical pesticide, which can be selected, but the effect is not stable. Although pyrethroids pesticides are not highly toxic pesticides, they are recommended not to be used because of their great lethality to natural enemies. Omethoate and dimethoate are highly and moderately toxic organophosphorus pesticides and should not be selected as far as possible. However, highly toxic organophosphorus pesticides such as methyl 1605, 1605, methamidophos and monocrotophos are not in the right way, and their use will be completely banned from January 1, 2007, so they can not be selected.
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Main cultivation techniques of New late Japonica Rice Variety Ning 88
The main results are as follows: 1. Sparsely sowing strong seedlings and transplanting at the right time. The sowing date of single cropping late rice is June 5-15, the seed amount per mu is 2.5-3.0kg, the sowing rate of seedling field is 30kg per mu, the seedling age is 25 days, and the sowing date is June 25-30. The amount of seed used per mu is about 3.0kg, the sowing rate of seedling field is 25-30kg per mu, and the seedling age is about 25 days. For continuous late machine transplanting or throwing seedling cultivation, the seed amount per mu is 3.0-4.0kg, the seeding rate in the seedling field is 35-40kg per mu, July 5-1.
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Introduction of two new combinations of early brilliant rice with high yield, medium maturity and high quality
T you 898: a new early indica rice combination selected by Hunan Longping Hi-Tech Nongping seed Industry Co., Ltd. It passed the variety approval of Jiangxi Province in 2005 (approval No.: Ganshendao 2005080L characteristics: cultivated as early rice in Jiangxi, the whole growth period is about 115 days. The plant height is 95 cm, the plant and leaf type is good, the tillering ability is strong, the stem is stout, the panicle rate is high, the color is good in the later stage, and there is no grain drop. 667 square meters (1 mu) effective panicle 220000, total grains per panicle 119.6, 1000-grain weight 24.7g, grain slender and long
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