Suitability of herbal pesticides, turmeric and neem, in repelling dry fish insect Necrobia sp. adult

Aakm Nowsad,Mm Hossain,Mn Hassan,Uj Lithi

doi:10.3329/jbau.v10i2.14927

Aakm Nowsad, Mm Hossain + Show 2 more

Open Access

https://doi.org/10.3329/jbau.v10i2.14927

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Abstract

Repellency effect of turmeric and neem was investigated against the mite Necrobia sp. and field doses were determined on the basis of their repellency, keeping quality, insect occurrence and sensory evaluation of turmeric and neem treated dry fish and their cooked products. Turmeric and neem were used in three forms, viz., i. extract, ii. powder and iii. pellet. The concentrations tested for turmeric and neem extracts were 2%, 3%, 4% and 3%, 5%, 7%, respectively, those of both powders were 1.0%, 1.5% and 2.0% and both pellets were 1, 2, 3 pieces on 100 g dry fish. The order of repellency among three products were: extract> powder> pellet. Turmeric extract and powder were more repellent than neem extract and powder. The color, odor, texture and general appearance of the untreated control and treated dry fish were almost similar after 2 month of storage at room temperature. After 4 month of storage, the sensory attributes like odor, texture and general appearance and the occurrence of insects in control dry fish fell down significantly but those in treated dry fish were mostly unchanged. Study suggested that turmeric at the rate of 3% extract or 1.5% powder or neem at the rate 5% extract or 1.5% powder could be suitable field doses for application of such herbs in dry fish directly to repel insects while storing the products.DOI: http://dx.doi.org/10.3329/jbau.v10i2.14927 J. Bangladesh Agril. Univ. 10(2): 339-348, 2012

Highlights

Dry fish is an important source of animal protein and people eat dry fish as a tasty dish all over the country
Dry fish are contaminated by both insects and insecticides comprise about 60% of the total dried products that is considered to be unfit for human consumption (Neuschler, 1998)
Keeping quality of dry fish treated with turmeric and neem products at room and refrigeration temperatures was investigated by sensory test, physical test, total volatile base nitrogen (TVB-N) concentration and microbial load determination

Summary

Introduction

Dry fish is an important source of animal protein and people eat dry fish as a tasty dish all over the country. Major problems associated with the sun-drying of fish is the infestation of the products by the blow fly and beetle larvae (Nowsad, 2005). - both larvae and adult) and mite (Nacrobia sp.) infestations during storage and distribution These insects are generally associated with dry fish especially during storage, transportation and marketing (Don-Pedro, 1989). Plants like neem and turmeric had shown effective repellent effects on beetles and mites of dried fish (Nowsad, 2005). The study was designed to determine the efficacy of neem and turmeric in extracts, powder and pellets in repelling Necrobia mite Field dosages of these herbs against Nacrobia sp. Field dosages of these herbs against Nacrobia sp. (adult) was determined and quality of neem and turmeric treated dry fish and their cooked products was assessed

Materials and Methods

Results and Discussion

Texture General