At the stage of stem elongation, rice is threatened by the risk of the infectious diseases
Statistically, rice leaf blight infects 673 hectares, rising by 338 hectares compared with the previous month; rice blast infects 1,213 hectares, rising by 791 compared with the previous month; sheath disease infects 328 hectares, rising by 188 hectares compared with the previous month; brown hoppers infect 268 hectares, rising by 148 hectares compared with the previous month since mature hoppers spread out with 1,000 – 1,500 heads/m2. The reason for low density of brown hoppers is due to high death rate after heavy rains.
In an alert of provincial Department of Plant Protection, in the next month’s intensified cold air mass, rain will be reduced and the year 2011’s rainy season comes to an end in the midst of the month. From midnight to the early morning, it turns cold and possibly foggy at such districts as Tan Phu, Dinh Quan, Long Khanh, Xuan Loc. This weather condition can affect plant growth. Therefore, farmers need to focus on preventing common harmful pests for plants. For rice at the growing stage, brown hoppers should be monitored and pesticide is sprayed on the principle of 4 rights; field tracking detects rice grassy stunt early to immediately remove the diseased rice to prevent infection, and fertilizer with high content of P and K chemical factors to enhance rice immunity; regularly clear grass away from the field dam to remove remained pests and diseases. For the rice at heading stage, it needs pre-heading fertilizer, less nitrogen and more potassium to restrict pests and diseases; rice blast and stunt disease must be early detected to protect rice on time.
Reported by T.Canh, Translated by Minh Minh