and Integrated Pest Management - part - usaid

Insecticides Distibuted
(tons, X 1000)
Figure 1. Total 18
volume of insecticides
distributed i n 17 -
Indonesia, 1981­
1986. 16­
15­
14­
13­
12-
II­
10 ­
9
INSECTICDE RESISTANCE IN INDONESIA 293
8 I I I I _ _
1981 1982 1983 1984 1985 1986
Year
populations were obtained (Kilin et al. 1979); however, 1984 data showed a
threefold increase of LD 5 0 values (Sutrisno, BCs .IF, unpublished).
In 1986, four populations of BP-I colilct:..f"om Segunung, Bantul, Sleman
and Boyolali, Java, were tested with several ii-.ecticides, including diazinon and
carbaryl. A comparison of the obtained LD 5 0 values with previous data showed
there was no clear evidence of insecticide resistance in the insect. A maximum
of fivefold increase of LD 5 0 values was deected with carbaryl and the lowest
LD 5 0 value (4.1 ng/female insect) was recorded in the BPH collected from
Segunung, the mountainous area where ir.secticides are mainly used for vegetable
crops (Kilin et al. 1987).
From this study, no clear information of BPH resistance to any insecticide
marketed in Indonesia was found. This may be due to several factors, such as the
low amount of insecticide applied to rice (average being less than 1.0 kg/ha,
Table 2), and the frequent change of insecticides due to the availability of many
compounds.
A more extensive study is underway to detect resistance phenomena in BPH
populations collected from several places in North Sumatra, West, Central, and
East Java.