Occurrence and control of rice diseases and insect pests in recent years

Since July, our city has encountered continuous overcast rain and high temperature after rain, which is very beneficial to the occurrence of diseases and insect pests in the later stage of rice. At present, most of the rice in our city has entered the booting to heading stage, which is the susceptible period of rice diseases and insect pests. On August 7, we conducted a field investigation in Rudian, Datun and other places. Rice blast, sheath blight and rice leaf roller all occurred and were in urgent need of control. The details are as follows:.

Rice blast: leaf blast was found on Yunhui 290 planted in Datun Xinwafang, with a diseased leaf rate of 3.6%, a disease index of 0.75 and an area of 2 mu.

Sheath blight: common occurrence, serious field disease rate of 72%, disease rate of 42.8%, disease index of 11.35, general field disease rate of 45%, disease rate of 29.3%, disease index of 7.79, affected area of 15000 mu.

Rice leaf roller: common, the leaf rolling rate is 14.8-1.98%, there are a large number of adults in the field, the adult density is 1.67.8 per square meter, and the occurrence area is 15000 mu.

Suggestions on prevention and control:

First, raise awareness and strengthen guidance. All comprehensive agricultural service centers in villages and towns must clearly realize that whether the work of rice pest control in the later stage is good or not has a bearing on the overall situation of increasing agricultural production and farmers' income in the whole city, and must overcome luck and paralyze their minds. we should earnestly do a good job in the prevention and control of rice diseases and insect pests in the later stage.

Second, comprehensive inspection and timely prevention and control. All townships and townships should conduct a comprehensive field inspection, check seedlings and queue up for the old nest where rice blast occurred in previous years (Kafang Doumge, Tianxing, Jia Sha fence), and the fields where leaf blast occurred in the early stage. The fields where the seedlings grow too strongly and the leaf color is thick and green, especially in the high-quality conventional rice planting areas (Datun Longjing and Xinwafang), insist on the comprehensive application of pesticide to prevent rice blast at the heading stage, "rather believe it", "lose the ticket, protect the panicle", and do a good job in the prevention of panicle blast in the later stage.

III. Prevention and control methods

1. Rice blast: tricyclazole is the first choice for chemical control, and 75% tricyclazole wettable powder (75% tetracyclazole WP) is used for spray control at heading stage (5%). Serious fields insist on spraying again at the full heading stage to ensure the control effect.

2. Sheath blight: 25 grams of 20% Jinggangmycin powder and 100 kg spray on water.

3. Rice leaf roller: 48% Lesben EC 100ml/ mu or 98% Badan powder 50 g / mu or 5% fipronil suspension 40 ml / mu or 90% insecticidal wettable powder 50 g / mu mixed with 50 kg water spray.