Control of Laodelphax striatellus at panicle stage of rice
Grey planthopper can not only cause virus diseases such as rice stripe blight, but also concentrate on panicle damage in late rice panicle stage. In order to determine the control effect and application technology of Pyrazidone and other drugs on gray planthopper in late rice panicle stage, field experiments were carried out by Cheng Qinhai, Plant Protection Station, Haining City, Zhejiang Province.
Each mu was treated with 40% chlorpyrifos EC 100 ml, 10% enpyrimidine 30 ml, 10% chlorothioline wettable powder 30 g, 25% aphidione wettable powder 20 g, 25% buprofezin wettable powder 75 g and water control. When the rice is in the filling stage, use a manual sprayer to spray according to the water consumption of 50 kg per mu. When the pesticide was applied, the generations of gray planthopper overlapped obviously, and the younger nymph accounted for 58.3%.
The results showed that chlorpyrifos and pyramidone had ideal control effect on spike gray planthopper, and the former had good quick effect, and the latter had better persistence effect, followed by chlorthiazine and buprofezin. The damage of gray planthopper at panicle stage can be effectively controlled by one application of Pyrazidone, and the use of chlorpyrifos should be increased once.
According to the monitoring, the high temperature from July to August had an inhibitory effect on the gray planthopper, and the reproduction was accelerated after the weather turned cool in September. The suitable period for the control of gray planthopper at the heading stage was about 7 days after heading (mid-late September). It is suggested that pyrazidone can be used alternately with chlorpyrifos and dichlorvos to delay the emergence of drug resistance, and chlorpyrifos or dichlorvos can be mixed with Pyrazidone in the year when gray planthopper occurs, so as to enhance the quickness and persistence. 25% pyramidone wettable powder to control gray planthopper in late rice panicle stage, 20 grams per mu plus 50 kg water spray.
- Prev
7 to distinguish between true and false hybrid rice seeds
Look at the neatness. The seed shape of hybrid rice mixed with other rice is irregular. The seeds of male parents or other indica rice were slender and fuller than those of hybrid rice, while japonica rice was more round. Second, look at the husk color. There are slightly uneven yellowish brown on the husk of hybrid rice seeds.
- Next
Key points of Management in Grain filling stage of planting Rice
The grain filling stage is the key period to determine the yield of rice. Field management should aim to maintain roots and protect leaves, prevent premature senescence, improve photosynthetic efficiency, promote grain filling, and increase seed setting rate and grain weight. First, apply grain fertilizer to look at the seedlings, the fields and the sky. The leaves are yellow and swords.
Related
- A course of planting techniques and methods on how to grow carrots
- How to plant the latest tulips?
- Is it better to pick tea in the morning or in the afternoon? When is the best time for tea to be picked? what is the third or fifth tea?
- Launch Yuanxiao Happy combination Haocha + Tea Yuan healthy Taste
- Penghu Tourism "Fireworks 20 Parade with You"
- 2022 West Lake Happiness holds "Digital Revitalization Voucher" and draws iphone13 and laptop.
- Banqiao Fuzhou social houses are designed to change start-up combined with police elimination to create a safe and livable environment
- The convenient measure of "mechanical weeding" in Xinbei has been abused and the Agriculture Bureau has imposed heavy penalties on the illegal land consolidation.
- Changgeng University Joins Hands with Four Memory Factories to Rescue Memory Talent Shortage
- The list of Taiwan's top 100 MVP managers is listed by the Director-General of the Farmers' Association of Sanxia District.