Source: SEAMEO BIOTROP's Research Grant | 2020
Abstract:
Rice is often under threat of attack by various types of stored product insect during
its storage period. Therefore, economic threshold for rice due to stored product insect
attack during storage are needed. Fumigation failure is often occurs in the field, which is
thought to be due to the development of insect resistance to phosphine, so an appropriate
fumigation protocol is needed to control the insect pest Cryptolestes sp. in rice storage in
Indonesia. Differences in storage period and initial population density caused significant
effects on the level of final population and damage level of rice infested by S. zeamais, R.
dominica, T. castaneum, dan Cryptolestes sp. In general, it can be stated that the higher the
initial population will cause the higher level of their damages on rice and higher final
population. Based on our observation, infestation by primary pests such as S. zeamais and
R. dominica will cause higher damage level on rice compared to secondary pests such as T.
castaneum and Cryptolestes sp. The population growth pattern of each stored product
insect pest shows a differences which is influenced by the density of population and
storage time. Insect infestation on commodity can also cause changes in the moisture
content of commodities. Cryptolestes sp. with resistance level of (3.60 (Wajo), 6.72
(Probolinggo), and 12.22 (Bali) can be 100% controlled through fumigation at a dose of 2
tablets / ton for 2 and 3 weeks with optimal fumigation implementation techniques and
measured concentrations.
Keyword: economic threshold, stored product insect, damage, fumigation protocol,
resistance