【摘要】 为了探讨寄主钾营养对烟粉虱发育、存活和寄主选择的影响,设置了K0(0mg/L)、K30(30mg/L)、K60(60mg/L)、K120(120mg/L)和K240(240mg/L)5种不同钾浓度,研究了烟粉虱在不同处理黄瓜上的发育历期、存活率、体形以及成虫的寄主选择。结果表明:在温度(26±1)℃,相对湿度80%±5%的条件下,取食不同钾营养水平黄瓜的烟粉虱在发育历期、存活率、体形上均有差异,其中在K240处理黄瓜上烟粉虱若虫发育最慢,从卵到成虫的时间最长,为21.4天,而在K60处理黄瓜上最快,为18.3天。在不同钾浓度处理寄主上从卵到成虫存活率以K30处理黄瓜上最高(84.7%),其次依次为K60(83.8%)、K120(76.2%)、K0(71.4%)和K240(64.8%)。在体形上以K30处理黄瓜上最大,K240处理黄瓜上最小。寄主选择性试验结果表明,在温室条件下,烟粉虱成虫喜欢在K60处理黄瓜上取食和产卵。这些结果提示在一定范围内可以通过调节寄主钾营养状况来调控烟粉虱种群。更多还原

【Abstract】 To understand the effects of potassium nutrition of host-plant on the duration, survivorship, nymph body size and adult host selection of Bemisia tabaci, we conducted experiments with different potassium concentrations, K0(0 mg/L), K30(30 mg/L), K60(60 mg/L), K120(120 mg/L) and K240 (240 mg/L). The results showed that duration, survivorship and body size of the whitefly nymphs on the cucumber plants treated with different potassium concentrations were different. The total duration from egg to adult on plants with K240 potassium concentration was 21.4 days, and with K60 potassium concentration, 18.3 days. The total survival rates of the whiteflies from egg to adult were 71.4%, 84.7%, 83.8%, 76.2% and 64.8% on plants treated with K0, K30, K60, K120 and K240 potassium concentrations, respectively. In the host choice experiment, the number of adults and deposited eggs per plant were significantly higher on plants with K60 potassium concentration than on those with other concentrations. Implications of the current results in regulating sweetpotato whitefly populations through adjusting plant potassium nutrition were discussed.更多还原