| 論文英文摘要 |
Tetranychus urticae is the major mites occurred in screen cultivate papaya, and need to management intensively in Taiwan. In this study, we investigate the control efficiency of 11 commercial acaricides on T. urticae, the miticides were 2 % abamectin EC, 43.2 % bifenazate SC, 42 % clofentezine SC, 20 % cyflumetofen SC, 18.3 % fenazaquin SC, 10% fenpropathrin EC, 1 % milbemectin EC, 10 % tebufenpyrad WP, 10 % etoxazole SC, 30 % spirodiclofen
SC, 24 % spiromesifen SC, respectively. All the acaricides were focus on the control efficiency of female of T. urticae, beside etoxazole, spirodiclofen, and spiromesifen. Those three acaricides were carrying out the control study on egg and nymph stage of T. urticae. The colony of T. urticae were collect from Linnei, Yulin County, Zhongpu, Chiayi County, Danei, Tainan City, and Changzhi, Pintung County, respectively. We using spray tower to conduct the acaricides control efficiency on egg, nymph, and adults of T. urticae from 4 various districts, respectively. Only bifenazate have high control efficiency of T. urticae among 4 different districts. The otheracaricides have poorly control efficiency against female mites. On the control study of egg stage, the effect of spiromesifen on eggs was the best, and the rate of control reached 100 %. There had various control efficiency on egg according to various districts by etoxazole. The best control efficiency on Changzhi area is 81.8 %. The same
acaricides have different control rate for different area colony on the nymph stage study. Spiromesifen is still the best acaricides, and the ecoxazole has the biggest variation on control efficiency, there is 82.8 % in Changzhi area, and only 2.5 % in Zhongpu area. The phenomenon that acaricides registered on papaya are generally unable to control T. urticae is worthy of attention, and should be properly developed for the strategy of managing spider mites. |