论文部分内容阅读
为明确有效积温、土壤含水量对桃小食心虫Carposina sasakii Matsumura出土羽化的影响,在室内控制土壤温、湿度的条件下测定了越冬代和第1代各生命阶段的有效积温,于2010—2015年在山西省临县枣园对越冬幼虫和成虫动态进行调查,并对田间土壤温度和含水量进行系统监测。结果表明:桃小食心虫室内越冬幼虫出土积温为258.2日度;而受5月份首次有效降雨日的影响,田间出土积温存在384.2~764.6日度的年度变化。土壤含水量对越冬幼虫出土模式及出土率有显著影响。持续干旱或土壤高湿均可导致双峰现象,土壤高湿的频繁出现还可显著降低幼虫出土率。通过6年田间监测数据的分析表明,越冬幼虫首现日与有效降雨日无显著相关性,而首现日有效积温(y)与降雨日有效积温(x)呈极显著正相关,回归方程为y=0.7758x+188.16(r=0.997,P<0.001)。
In order to clarify the effect of effective accumulated temperature and soil water content on emergence of Carposina sasakii Matsumura, the effective accumulated temperature of overwintering and first-generation life stages was determined under the control of soil temperature and humidity indoors. The dynamics of overwintering larvae and adult adults were investigated in Zaoyuan, Linxian County, Shanxi Province, and the soil temperature and water content in the field were systematically monitored. The results showed that the accumulated temperature of indoor overwintering larvae of Peach moth was 258.2 days, while the annual accumulated temperature of 384.2-764.6 days was affected by the first effective rainfall day in May. Soil water content has a significant effect on the pattern of unearthing and pattern of overwintering larvae. Continued droughts or high soil moisture can lead to bimodal phenomena. The frequent occurrence of high soil moisture can also significantly reduce the rate of larval emergence. Based on the field monitoring data of six years, it was found that there was no significant correlation between the first day of overwintering larvae and the effective rainfall day, while the first effective daily accumulated temperature (y) was significantly and positively correlated with the effective accumulated temperature (x) of rainfall day. The regression equation y = 0.7758x + 188.16 (r = 0.997, P <0.001).