Stored-Product Insect Infestation on Rice: Analysis of Economic Losses and Development of Fumigation Protocol to Manage Phosphine Resistant Strain of Cryptolestes spp. (Coleoptera: Laemophloeidae) in Rice Storage Facilities
I. S. Harahap, . S. Widayanti, T. A. Widinni A., H. Widhiastuti

Source: SEAMEO BIOTROP's Research Grant | 2020


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 

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