Table 1 The knockdown activity of KD₅₀ dose of 2,3-dimethylmaleic anhydride against P. americana and S. oryzae at different exposure period.

30

0

12.3 ± 2.4^a

0.8 ± 0.2^a

27.9 ± 2.4^a

60

0

48.5 ± 1.4^b

2.2 ± 0.4^b

52.3 ± 1.4^b

90

1.2 ± 0.1^a

80.3 ± 1.2^c

3.7 ± 0.4^c

78.3 ± 1.2^c

120

1.5 ± 0.2^b

90.2 ± 2.8^d

5.2 ± 0.8^d

92.3 ± 1.4^d

150

1.8 ± 0.1^c

98.2 ± 1.2^e

6.5 ± 0.4^e

96.9 ± 2.2^e