Occurrence and Control of Pests and Diseases in Middle and Late Rice

According to my survey of station surveys and fixed-point surveys in Dongcheng, Nancheng, Xicheng, Nanping, Daguan, Xinglong, Hetu, and Shuijiang from July 16th to 18th, combining light induction, historical data, meteorological data, and crop growth periods Based on the comprehensive analysis, it is expected that the occurrence of pests in the middle and late stages of rice in our region will be dominated by the occurrence of rice planthoppers, rice stem fly, panicle blast, and sheath blight.

First, what happened:

1, rice planthoppers: great occurrences. As of July 17th, the number of large-observation and reporting sites totaled 7,355 white-flying flycatchers, which was 4.9 times higher than in 2011, which was higher than the normal number. According to survey conducted by Daguan Field, white-flying locusts amounted to 880-11260 heads/hundred plexus with an average of 4773.3 heads, which was 8.2 times that of 2012. Large-scale census insects amounted to 20-26100 heads/hundred plexus with an average of 2890 heads/hundred plexus. It is 1.7 times that of 2011. In individual towns and villages in Dongcheng and other towns and villages that have not yet been controlled, “pass fire fields” have emerged. A brown locust lamp elicited 505 heads and saw at the end of the field. According to the amount of insects in the period of migration and the occurrence of the field, it is expected that the peak period of the main damage of the whitebacked planthopper will be from July 30 to August 8, which will be postponed by 2-3 days from last year. In the middle of August, it will be mixed with the brown planthopper. .

2. Rice leaf roller: moderately mild. As of July 17th, two large observing motives had attracted moths. Fixed-point survey: No moths were found. The general leaf rolling rate was 0.1%, similar to last year. Large-scale census, the field is lower than in recent years. The leaf rolling rate in the field is below 0.1%. Due to the early low temperature, the growth period of rice was postponed and nitrogen fertilizers were applied by farmers. Therefore, in the middle and high mountainous regions, the three generations will suffer from late maturing and tender green fields.

3, rice blast disease: panicles occur in the emphasis. According to the survey, leaf pods began to occur on conventional japonica rice, japonica rice (specialized seedlings have already appeared “seedlings”) and hybrid rice, and the diseased leaf rate was 0-10.1%, with an average of 0.26%, 0.1% higher than last year. Current climatic conditions It is beneficial to Ye Yu. In addition, the Gangyou, Qyou, and II excellent varieties grown in our area are not resistant to the panicle rot. According to meteorological forecast, from late July to early August, the heading and flowering stage of rice in our country has a number of rainy weather processes. In addition, more than 800 meters above sea level, morning and evening dew wet, which is conducive to the epidemic of panicle blast, such as heading and flowering. - Over 5 days of rainy weather, panicles and necks will increase the damage.

4, rice sheath blight: Occurrence of moderate bias. According to the survey, the strain rate was 0-21.5% with an average of 6.8%, 3.1% higher than last year, and the disease index was 0.1-5.3, with an average of 1.6, similar to recent years. At present, it is the peak period of vertical spread of Rhizoctonia solani in rice, and the main crops are high soil fertility, high planting density, partial nitrogen fertilizer application, and heavy plant weight of rice planthoppers.

5, rice straw rod fly: moderate weight occurs. In the middle and late July, larvae damage the spikelet peak.

Second, prevention and control methods:

1 mu with 10% avid fluoroamide 20-30 ml + buprofezin 50 g + 20% Jinggangmycin 40 g, attending rice planthoppers, rice aphids, rice leaf roller and sheath blight, and other treatments Pests.

2. Mu 40% Thiamethoxam chlorantraniliprole benzamide 8g + 75% tricyclazole 25-30g or Bacillus subtilis 10-12g or 40% rice bran 100g, attending rice planthopper, rice straw Roll leafhoppers, rice blast, and other pests.

3, mu with 20% chlorantraniliprole 10ml + buprofezin 50g + 20% Jinggangmycin 40-50g Indications rice planthopper, aphids, rice leaf roller, rice sheath blight.

The above medicine is watered with 60 kg manual spray or watered 7-10 kg motorized spray.

special reminder:

1. When preventing panicle blast, it is necessary to apply two drugs at the beginning and the full ear of rice to prevent it. The effect is good.

2. Controlling brown planthoppers, disinfecting imidacloprids, and preventing the use of tricyclazole as a compound preparation for the prevention of panicle blasts.

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