RESISTANCE TO CHLORANTRANILIPROLE
LC50 values of chlorantraniliprole against DBM were in the range
of 0.15 mg/L in WA13 and 37.27 mg/L in WX13B (Table 3). Most of
the field populations were susceptible (RR < 3.0) to chlorantraniliprole
during the 2 years, except for the BS13 (4.6-fold), HZ13 (5.3-fold) and
PD13 (3.4-fold) with decreased susceptibility to low resistance. How
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ever, there was a progressive decreased susceptibility to chlorantra
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niliprole from 2012 to 2013. TH12 (24.8-fold) and TH13A (22.7-fold)
had developed moderate level of resistance to chlorantraniliprole.
TH13B (63.4-fold), WX12 (61.4-fold), WX13A (85.4-fold) and WX13B
(162.0-fold) populations had developed high to very high level of resis
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tance to chlorantraniliprole.