INVESTIGATION OF DRIED FISH PEST SPECIES IN NORTHERN BANGLADESH AND MANAGEMENT OF Dermestes maculatus DEGEER (COLEOPTERA: DERMESTIDAE) WITH BOTANICALS AND MINERAL USED AS FOOD ADDITIVES

Abstract

The research work conducted on pest complex, incidence, seasonal abundance and damage intensity of dried fish consumed in northern Bangladesh as well as to investigate the biological activity of edible botanicals and mineral against Dermestes maculatus. Eight sp. of pests D.maculatus, Necrobia rufipes, Calliphora sp., Musca domestica, Forficula auricularia, Lardoglyphus spp., Solenopsis invicta and D.frischii were found to infest. Among them, two species, D. maculatus and N. rufipes were major and the rests were minor pests. D. maculatus and N. rufipes infested 15 and 13 species of the total tested dried fishes which were almost 35.7 and 31.0%, respectively. The population density of both species of adults and larvae were peak in mid June to mid November. The highest mortality (100%) of adult and larvae of D. maculatus were observed when fed on dried L. calcarifer mixed with salt and black pepper powders in primary screening. In the secondary screening test, the highest adult and larval mortalities (100%) occurred at 7th and 3rd days after treatment while applied salt and black pepper at 16g and salt at 14g. The lowest LT50 values 2.80; 1.45 days and 2.65; 2.14 days for the adults and larvae were observed while applied Salt and black pepper at 16g, respectively. Repellency rate was the maximum 100% when applied salt and black pepper at 12, 14, 16g both for the adult and larva and repellency class was V. Among the treatments, salt was observed to be the most effective and no weight loss of L. calcarifer was measured whereas the control showed highest 24.5%. Black pepper showed the second lowest weight loss 5.3% and 8.3% against the adult and larva at 16g. The highest weight loss 30.3% was found by larva in the control and no weight loss was found in salt in every doses. The maximum adult mortality 100% was recorded on 6th DAT with shortest LT50 3.07 days when applied mixture of 14g black pepper and 16g turmeric. The maximum larval mortality (100%) was observed on 4th DAT when applied mixture of black pepper (14g) and turmeric (16g) with shortest LT50 2.31 days. Therefore, this mixture could have used to manage the pest.