Abstract:

Sunflower is the major cash crops in Bayannaoer, and accounted more than 30% for the total crop sowing area of the city, while the sunflower Sclerotinia was restricting the healthy development of the industry. It could be judged early the sunflower Sclerotinia appear sooner or later and the occurrence of the degree of severity by meteorological index, therefore, it was very important to guide the production and scientific control. Correlation analysis was performed between data about appearance of central infected plants, prosperous beginning stage, occurrence degree for sunflower Sclerotinia sclerotiorum in hetao irrigation district and meteorological data in corresponding period, and corresponding predictive equations were established and established the prediction equation. The results showed that 13 index were identified, 7 were indicators before late April. Most of these indicators, directly or indirectly affected soil moisture, soil moisture changed by sunflower Sclerotinia occurred sooner or later, the occurrence of high and low degree. June was the critical period, June winds for each additional day, Sclerotinia center stage and the beginning of peak strain there were 12.1 days and 2.5 days in advance, average minimum temperature in mid-June was increased by 1℃, Sclerotinia appeared before peak 1 day in advance. The average maximum temperature was increased in mid-1℃, higher levels of 0.09 Sclerotinia occurred.