highly significantp ≤ 0.0001
Highly significant differences in life stages mortality among concentration were found by direct spray (df = 4, 149, p ≤ 0.0001) for 2nd instar: F = 26.01, 3rd instar: F = 22.20, 4th instar: F = 18.04, 5th instar: F = 13.63, and adult: F = 6.25 and by contact (df = 4, 149, p ≤ 0.0001) for 2nd instar: F = 16.06, 3rd instar: F = 9.95, 4th instar: F = 21.23, 5th instar: F = 6.29, and adult: F = 3.78 with an obvious decreasing pathogenicity pattern from younger to older instars to adult stage at all concentrations.