摘要
利用生命表技术评价了在网室条件下玫烟色拟青霉和吡虫啉对烟粉虱种群的控制作用。在0·3%吡虫啉+1×106分生孢子/ml、0·1%吡虫啉+1×106分生孢子/ml、10%吡虫啉、1·0×106个孢子/ml菌液、1·0×106个孢子/ml菌液连续施用2次等5个不同的处理区,玫烟色拟青霉对第一代和第二代烟粉虱的种群干扰作用控制指数(IIPC)分别为0·5476、0·6836、0·3123、0·7278、0·4959和0·1566、0·1625、0·9830、0·2532、0·1349。其中,以使用0·3%吡虫啉+1·0×106分生孢子/ml处理区对烟粉虱种群的控制效果最好。玫烟色拟青霉与低浓度的吡虫啉混合使用能较好地发挥联合控制作用,对玫烟色拟青霉的累积控制效应无负面影响。
Combining Paecilomyces fumosoroseus and imidaclropid as an integrated approach to control Bemisia tabaci was evaluated using life table parameters. In the laboratory, the index of population trend （Ⅰ） of B. tabaci was 9.0216 in the untreated control after one generation. After applications of P. fumosoreosus at a concentration of 1×10^6 conidia/ml alone and in combinations with 0.3 and 0.1% of imidacloprid, the Is of B. tabaci decreased to 3.3769, 1.1986, and 1.8512, respectively. The results show that combinations of P. fumosoreosus with imidacloprid exhibit strong synergistic effects against B. tabaci, and the interference index of population control （IIPC） of B. tabaci with the same treatments were 0.3743, 0. 1329, and 0.2052, respectively.
Under greenhouse conditions, the Ⅰ and IIPC of B. tabaci in the first generation were evaluated with five treatments： one application of P. fumosoroseus （ 1×10^6 conidia/ml） alone and in combination with 0.3 and 0.1% of imidacloprid, and 10% of imidacloprid alone, and two applications of P. fumosoroseus （1×10^6 conidia/ml） alone. The Is for the five treatments were 8.4348, 6.3458, 7.9336, 3.6191, and 5.746, respectively, and the corresponding IIPC values were 0.7278, 0.5476, 0.6836, 0.3123 and 0.4959, respectively. The Ⅰ values were reduced by 27.2, 45.2, 31.6, 68.8, and 50.4%, respectively,as compared with that in the untreated control. We found that the combinations of P. fumosoroseus and imidacloprid caused high mortality of young B. tabaci nymphs, whereas P. fumosoroseus alone caused high mortality of old B. tabaci nymphs. We also found that one application of the combinations of P. fumosoroseus with imidacloprid were more effective against B. tabaci than one application of P. fumosoroseus alone, but were not as effective as two applications of P. fumosoroseus used alone.
After applications of P. fumosoroseus with combinations of 0.3 and 0.1% of imidacloprid, and 10% of imidacloprid alone, the Is of B. tabaci in the second generation were 1.2443, 1.2915 and 7.8124, and the IIPC values were 0. 1566, 0. 1625 and 0.9830, respectively. When P. fumosoroseus was used alone once and twice, the Is were 2.0125 and 1.0718, and IIPC values were 0. 2532 and 0.1349, respectively. Compared with the untreated control, the corresponding Is values in the above treatments were reduced by 84.3, 83.8, 1.7, 74.7, and 86.5%, respectively. P. fumosoroseus （1×10^6 conidia/ml） applied twice provided the best control of B. tabaci, whereas 10% of imidacloprid alone was the least effective. Based on the life table parameters of B. tabaci for two generations, P. fumosoroseus combined with imidacloprid provided better control than each of the two used alone, and continuous applications of these two materials for controlling B. tabaci for two generations provided better control than for one generation. Practically, early application of P. fumosoroseus （1×10^6 conidia/ml） blended with 0.3% of imidacloprid would provide the best control of second instar B. tabaci.
出处
《生态学报》
CAS
CSCD
北大核心
2006年第10期3250-3257,共8页
Acta Ecologica Sinica
基金
国家"973"重大科技资助项目(2006CB102005)
国家"十五"攻关课题资助项目(2003BA509130604)
广东省自然科学基金资助项目(010312)~~
关键词
玫烟色拟青霉
烟粉虱
IPM
吡虫啉
杀虫剂
混合物
Paecilomyces fumosomseus
Bemisia tabaci
IPM
imidacloprid
insecticides
mixture
