Today's autumn, the sixth month of the lunar calendar belongs to the early autumn, in the middle and late stages, the temperature in the southern region is not lower than the size of the summer. Recently, the sunshine, heat, high temperature and little rain have an inhibitory effect on the occurrence of diseases and insect pests, and crops will also be affected by high temperature and heat damage, such as the decline of the seed setting rate when the rice in the pregnant ear is ≥ 35 °C for many consecutive days, and the irrigation and foliar spray fertilizer regulation are paid attention to.
Brown planthopper is the most harmful of rice planthoppers, according to the past occurrence of the law summed up "summer is not hot, late autumn is not cool" is its outbreak of the climatic phase. From 2005 to 2007, brown planthoppers broke out continuously, of which the summer and autumn of 2005 was the maximum temperature of July and August ≥ 35 °C days for 17 days, which was less than the historical average (the maximum temperature in July and August≥ was 35 °C historical average of 18.5 days), and the temperature from September to mid-October was high, which was in line with the climate of "no heat in mid-summer, not cool in late autumn"; the rainfall in June and September was higher than usual, and there were many typhoons during the period that brought rainfall, forming a climatic environment conducive to the growth and reproduction of brown planthoppers. The initial brown planthopper migration was early and the amount of migration was moderate, and the climatic influences led to the reproduction of native insect sources and the re-migration of multiple batches of insects, thus forming a high-incidence population.
From July, the high temperature weather (≥35 ° C) is less than last year, but the end of July has been more hot since then, which is a bit in line with the "midsummer is not hot". In particular, the mid-summer non-heat means that the summer high temperature (≥35 ° C) weather is less than the annual or historical average, not that there is no high temperature weather.
According to the meteorological forecast, it is expected that the weather situation of this year's autumn festival is more similar to that of the usual year, there will be rainfall in South China, and the rainfall may be more than in the same period; in the next 10 days, Jiangnan and Jianghuai will still have high temperature weather for many days. August and September are typhoon-prone periods, so in August, the south and southeast coasts of South China will be affected by typhoons from time to time.
Judging from the information on diseases and insects in the past two months, this year's rice planthoppers moved in early and the amount of insects is more, and the current number of planthopper bases in regenerated rice and one-season rice in various places is relatively large, and it is expected that rice planthoppers in the south will be more serious. According to a survey conducted by all parts of Jiangxi on July 30, the amount of rice planthoppers in a rice field is generally 520-1600, the high is 2500-3800, and the highest is more than 100,000 in Jinggangshan, exceeding the control index by more than 100 times, an increase of 3-4 times year-on-year.
In summary, how difficult the weather is to predict this autumn, whether it will be "not hot in midsummer, not cool in late autumn" The climate is difficult to say, but this year's rice planthopper base is very large, plus the middle rice is in the panicle extraction period, the field is shaded, and the reproduction is relatively fast, so it is still necessary to be vigilant against the occurrence of rice planthoppers and pay attention to prevention in place.
Prevention and control methods of rice planthopper: When the number of 100 bush insects in the field reaches 1000 or when there are more rice planthoppers in the field, it is optional to use prazidone, alenazone, trifluorophenazine, furazine, flufenacil, enadil, pyrazone, furazonamide and other agents for control, sprayed with water to the base of rice, and maintain a certain aquiferoccal layer in the field when applying. When the rice planthopper is heavy, in addition to using a combination spray of quick-acting and effective drugs, it can be sprinkled with dichlorvos on a sunny day, and the effect is better than the spray effect.
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