and Integrated Pest Management - part - usaid

Table 3. Comparative economics of different insecticides use strategies on BPH-susceptible and resistant rice varieties. B
Jatisari, W. Java, wet season, 1986/87.
Regime Number of Yielda Gain from insecticideb Benefit/Cost ratiob
insecticide BIMAS Free market BIMAS Free market
applications (k-/ha) (USS/ha)
Var. Pelita (BPH-susceptible)
Untreated 0 4401 b
MaAimum protection 8 6939 a + 184.0 + 83.7 6.63 1.63
Minimum protection 2 5870 ab + 108.9 + 56.9 7.58 1.83
Low economic threshold 8 5783 ab + 90.6 + 4.5 4.31 1.04
High economic threshold 5 5187 ab + 48.8 - 10.6 3.67 0.86
Farmerpractices 3 5351 ab + 72.3 +45.9 9.20 2.30
Var. Cisad-ane (BPH-resistan,)
Untreated 0 6334 a -
Maximum protection 8 7212 a + 16.0 - 58.0 2.29 0.56
Minimum protection 1 6983 a + 42.1 + 0.14 4.15 1.00
Low economic threshold 4 6614 a + 9.3 - 36.5 1.64 0.40
High economic threshold 1 6742 a + 29.3 + 10.1 6.35 1.41
Farmer practices 3 6917 a + 50.0 + 14.5 5.65 1.41
aMean of 3 replicates, corrected to 14% moisture content. Means with the same letter are not significantly different at P =
0.05 by DMRT. bCost based on estimates where a compound is not registered or sold in the free market.
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