甘薯小象甲对不同甘薯品种的趋性反应试验

成虫取食主要取决于气味诱导和对物体性状的偏好,为了解小象甲对不同品种甘薯气味的选择性与品种抗虫的相关性;选取14个甘薯品种,利用Y型嗅觉仪测定小象甲对14个甘薯品种进行气味选择试验,并计算各品种的抗性。结果显示,小象甲对14个不同品种甘薯的反应率、诱集率以及选择系数都具有差异显著性,小象甲对14个甘薯品种的反应率在0.3~1之间,不同品种对甘薯小象甲的诱集率在0.2~0.9556之间,小象甲对不同甘薯品种之间的选择系数在-0.03~0.91之间,其中‘鄂薯15’选择系数最小为-0.03,表现为最抗小象甲;‘鄂薯6号’和‘商薯19’的选择系数最大且都为0.91,表现为最感小象甲。本研究为甘薯小象甲的防治奠定了基础,对今后完善抗甘薯小象甲品种的鉴定工作有很大帮助。

Chemotaxis Test of Sweetpotato Weevil (Cylas formicarius) to Sweet Potato Varieties

Odor induction and feature preference are major factors affecting sweetpotato weevil’s feeding. In order to understand the selectivity of sweetpotato weevil to odor of different sweet potato varieties and correlation between sweet potato’s odor and weevil resistance, an odor selection test of 14 sweet potato varieties was carried out by using Y-type olfactometer, and each variety’s resistance was calculated. The results showed that the response rate, trapping rate, and selection coefficient of sweetpotato weevil to 14 sweet potato varieties were significantly different. The response rate, trapping rate, and selection coefficient was 0.3-1, 02-0.9556, and -0.03-0.91, respectively. Among the 14 varieties, Eshu 15 had the minimum selection coefficient of -0.03, showing the highest weevil resistance, while both Eshu 6 and Shangshu 19 had the maximum selection coefficient of 0.91, showing the highest susceptive to weevil. This study establishes a basis for sweetpotato weevil control and will help the identification of weevil-resistant sweet potato variety.