Efficacy of insecticidal control in pomelo fruit fly IPM program in Nakhon Si Thammarat province, Thailand

Abstract

The major problem of pomelo production is fruit fly (Tephritidae; Diptera), that damaging causes fruits to fall from the trees so that it is necessary for farmers to use chemicals for controlling continuously. The IPM program for controlling fruit flies were used in Taptim Siam pomelo orchards in Pakpanang district, Nakhon Si Thammarat province, Thailand, from May 2012 to August 2013, with 4-time spraying, 10 days apart during the period of 3-month-old pomelo fruits. The experimental design using RCBD with 3 replications and 6 methods (M) was: 1.(M1)imidacloprid10%SL+imidacloprid 10%SL+fipronil 5%SC+ imidacloprid 10%SL,  2.(M2) abamectin 1.8% EC+ imidacloprid 10%SL+ fipronil 5%SC+ abamectin 1.8% EC, 3. (M3) petroleum oil 83.9% EC + imidacloprid 10%SL+ fipronil 5%SC+ petroleum oil 83.9% EC, 4.(M4) Thai neem extract (aza. 0.05%)+ imidacloprid 10%SL+ fipronil 5%SC+ Thai neem extract (aza. 0.05%), 5.(M5: farmer method) abamectin 1.8% EC+ abamectin 1.8% EC + abamectin 1.8% EC +abamectin 1.8% EC and 6.(M6) control (non treated). The results revealed that, the average numbers of fruit damage (sting mark per fruit) before sprayed  were 0.49-0.72 sting mark per fruit, not significantly different (p>0.05) from the control. The average numbers of fruit damage after application IPM program at the time of 3,4,5 and 6 month-old  pomelo fruits,  found that  all methods were  significantly difference (p<0.01) from  control (non treated), were 0.50-1.05,  0.60-1.39, 0.65-1.39 and  0.75-1.39 sting  mark per fruit,  respectively. The highest effectiveness method at  harvesting stage(6-month-old pomelo fruits) was M5 (81.35%), followed by M1, M2 and M3 at81.29 81.29 and 78.22 %, respectively. The lowest effectiveness method was M4 (76.98%) compared with control (non treated).