and Integrated Pest Management - part - usaid

ROLE OF INSE-TICIDES INRICE IPM SYSTEMS 69
untreated plot; the same treatment needed only two applications and had the
lowest hopperburn (Table 1). The next most effective treatment was the
combination of diazinon and BPMC, in which three applications were needed and
hopperburn was much lower than the control.
The other insecticides tested - cyanophenfos, phentoate, deltametrin,
fenitrothion, DDVP and methomyl - showed higher 13PH populations than the
untreated plot. This was the first reported case of BPH resurgence in Indonesia
and suggested that more research needed to be done to identify the cause.
The predator populations in plots treated with insecticides that showed
resurgence were almost similar to those in the control plots, indicating that the
resurgence was not due to the death of natural enemies (Table 2). We also found
Table 2. Populations of predators before and after insecticide applications.
Klaten, planting season, 1978.
Insecticides Dosage
(a.i./kg) S ~~ Coccin1I_
Populationa
Cyrtorhi
s
Paederu
s
aa = before insecticide application, b = after insecticide application.
Casnodea
No. of
applic­
ha a b a b a b a b a b tions
DDVP 1.00 9 8 1 5 1 0 0 2 0 1 4
50 EC
Methomyl 0.54 11 7 2 4 1 0 0 1 1 1 5
20 EC
Phentoate 1.20 12 8 0 5 0 0 1 1 1 1 5
50 L
CyanophcnfosO.75 10 8 1 5 1 0 1 1 1 1 5
25 EC
Fenitrothion 1.20 12 11 2 6 0 0 1 2 1 1 5
50 EC
Daltametrin 0.01 11 8 1 6 1 0 1 2 0 2 5
2.5 EC
Phentoate 1.20 14 9 1 6 0 0 1 2 2 2 5
60 EC
Pyridaphen- 1.00 11 9 1 5 1 0 0 2 2 1 3
thion M 50
Fenitrothion 1.12 13 8 1 3 0 0 1 2 0 2 2
+ BPMC
75 EC
Diazinon 0.75 12 10 1 6 1 0 1 2 0 2 3
+ BPMC
750 EC
Fenitrothion 0.75 11 8 1 5 1 0 1 3 1 2 2
+ BPMC
Control -9 1 3 1 0 0 1 1 2 -