Low temperature and rainy weather prevent disease at rice ear stage

In late August, the rainfall in most parts of the province was relatively large and the temperature dropped rapidly. The maximum temperature was only 28°C and the minimum temperature was 22°C on 27-28 days. According to the forecast of the Provincial Meteorological Observatory, the province is still dominated by cloudy and thundery showers in recent days. Although the temperature has rebounded, the temperature above 35°C rarely occurs again. Rainy weather causes high humidity, low temperature, and low light. At this time, rice in most parts of northern Jiangsu and Central China is at the heading stage, and it is prone to diseases such as panicle blast and rice smut. All localities should step up prevention and cure of these heading diseases, and at the same time prevention and treatment of sheath blight cannot be relaxed.

Due to rainfall, the field has a large amount of humidity in the field, the temperature has dropped, there is dew in the evening, and sometimes there is fog in the morning. The weather condition is very favorable for the occurrence of panicle cervix. At present, rice has entered the heading stage, and the newly emerged panicles and necks are very young, and it is easy to infect panicles, branches, and grains. Should seize the rice breakage period in the beginning of September, the heading period of each drug once, applicable drugs are tricyclazole, rice bran, etc., pay attention to alternate use, after the drug within 5 hours of rain to make up spray, in case of rainy days to grab the rain Gap medication. To avoid two prevention errors: First, the emergence of white spike only medication. The rice blast fungus did not show symptoms when he just invaded, and the symptoms were not obvious at the early stage of the disease. It was too late to wait until the panicle neck necrosis occurred. The second is that there are no drugs for fighting disease. Heavy crops with persistent rice blast, or partial nitrogen fertilization, and rainy weather at the heading stage, may cause serious disease even if planting resistant varieties. Therefore, regardless of whether it is a disease-resistant variety, we must not ignore the prevention and treatment of panicle blast.

Usually, late-maturing varieties are more severe than those of early-maturing varieties; varieties with short dwarfs, large spikes, broad leaves, and small angles, resistant to lodging, and suitable for close planting are more serious; varieties with coarse glume on the surface of shells are heavy; stigmas are exposed High-yield spikelets and hybrid rice varieties are susceptible to disease. Rice cultivars invade flower plants by wind and rain, and the heading and flowering seasons of rice are more rainy, rainfall is greater, the humidity in the fields is higher, the sunshine is less, and the incidence is heavier. The recent weather conditions are suitable for the occurrence of rice smut. The key to prevention and control is to use drugs 5-7 days before heading and 5-7 days after heading. Suitable drugs include benzoylzinc and B. japonica.

Rhizoctonia solani blight is a common disease in rice in our province, especially in Central and Northern Jiangsu Province. The field bacteria source is sufficient, and the high-yielding cultivation measures implemented in recent years are beneficial to sheath blight. As a result, there is a general tendency to increase. At present, we should pay close attention to the occurrence of disease in the field and control the use of drugs as soon as possible. The applicable drugs include the Shigella japonellae, benzoylzinc, and Jinggangmycin.

It should be noted that the use of rice during heading should be avoided during the blooming period, and it is advisable to spray before 10 o'clock in the morning or after 3 o'clock in the afternoon so as not to affect pollination.

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