and Integrated Pest Management - part - usaid

370 I'I STICIDI. MANAGI-N-IENT AND !I'M IN SOUTIIIMAST ASIA
Table 1. Residues of MVIPC in rice plants and paddy soil (Kanazawa et al.
1983a).
M IPC resilti (pnm) t
Frcquency Days before Ilulled Straw Soil
harvest grain
1 72 ND 0.020 0.002
1 39 0.007 0.171 0.007
1 24 0.073 0.329 0.010
3 72
39 0.180 0.398 0.026
24
0 ND ND ND
"dose of 1.6 kg a.i. per hectare per application. baverage of 2 replicates, ND =
- -P applicrliOn a
not detected.
The level of diazinon residues in hulled rice grains, straw, and paddy soil
was relatively low (Table 2). The residues in milled grains were below 0.02
ppn, i.e., below the perfissible level of 0.1 ppmn (in Japan). In the straw,
relatively high residues were found. The highest, 0.211 ppm, was found in
strawvwith three applications. The residue levels in straw were generally
influencecl by the preharvest interval rather than by the frequency of application.
Residue levels in paddy soil were relatively low and were almost the same in all
plots.
Table 2. Residues of (liazinon in rice plants and paddy soil (Kanazawa et al.
19831)).
M IPC appliction a
Frcqucncy Days before
harvest
! 72
1 39
1 24
3 72
MIPCresidcue(ppm)
Hlulled Straw
grain
0.009 0.030
0.010 0.052
0.013 0.170
b
Soil
0.023
0.031
0.031
39 0.012 0.211 0.031
24
0 ­ 0.009 0.035 0.013
"(lose of 1.2 kg a.i. per hectare per application. 1 average of 3 replicates.