Effects Of Different Tillage Methods On Pests And Diseases Occurrence For Wheat Following Rice

Based on cultivars of wheat yannong19for the test material, according to crop pest forecasting methods, The effect of different sowing methods on pests and diseases of wheat following rice were investigated in various growth stages of wheat from2009to2010at huaiyuan area in Bengbu city. Comparison of occurrence of the major insect pests and diseases for different planting methods of wheat following rice crop (artificial sow wheat, machine drilling wheat, no-till sowing wheat), combined with the occurrence of integrated pests and diseases of wheat in recent years, The rational and effective control measures were proposed to provide technical support. Main results are as follows:1. The occurrence of weeds in Wheat field. whether artificial sow tractor, machine drilling, or no-tillage cultivation sowing units, mainly in grass with both Alopecurus aequalis sobol, Vicia sativa L.and Malachium aquaticum (L.) Fries, With the highest Alopecurus aequalis sobol density of no-till sowing wheat, there are significant difference in the weed density. Years after the survey, the weeds plants in Wheat field were overall density as followed, no-till cover sowing wheat, artificial sow wheat, machine drilling wheat, the average per square meter were331,270and262, respectively.2.The disease severity of wheat sharp eyespot were overall ranked form high to low as followed, artificial sow wheat, machine drilling wheat, no-till cover sowing wheat. With the highest strain rate of the artificial sow wheat, the rate of infected plants, disease index and stem invasion rate is50.9%,21.2and9.23%, respectively. While the no-tillage rice-wheat rotation,, disease index and stem invasion rate was only19.34%,6.25and3.45%.3. The disease of Powdery mildew seriously occurred in no-till cover sowing wheat, there are significant difference in the disease severity. The highest rate of infected plants and stems index, disease leaves were93.3%,22.25and42.58%, respectively; while the highest rate of infected plants and stems index, diseased leaves of artificial sow wheat were11.67%,3.65and4.86%, respectively. The highest rate of infected plants and stems index, diseased leaves of machine drilling wheat were mean11.42%,3.45and4.13%, respectively.4. The rate of Wheat Scab of artificial sow wheat, machine drilling wheat, no-till cover sowing wheat was not significant and the difference final test area ear disease were14.37%,13.83%and13.27%, respectively. 5. Wheat aphid occurred in recent years has aggravated the trend. Test area with no-till cover sowing wheat, artificial sow wheat, machine drilling wheat aphid average amount of one hundred ear difference was not significant, respectively,411.8,413.3and411.16. In recent years, wheat yield were tested in different sowing methods, results showed the relative yield of wheat following rice crop is the most stable for machine drilling, there is some upward trend, while the no-till wheat sowing sets of factors affected by climatic fluctuations, the relative yield is unstable. Relatively high rainfall in spring2010, average yield of no-till sowing of wheat crop rice is292.75kg, while the artificial sow and machine drilling wheat, average yield, respectively,346.39kg and357.52kg...