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

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

Efficiency of organic pesticides, turmeric (Curcuma longa) and neem (Azadirachta indica) against dry fish beetle (Dermestes sp.) during storage condition

“…Likewise APC value, application of turmeric and neem in both form showed better reduction of microbial load. Lithi et al (2012) found that APC values decreased with increased doses of extracts and powders. Considering the factors like color, taste, insect occurrence, and general appearance, though all values of microbiological test were in safe range but relatively lower doses of extract and power can be suggested as field dose for application on dry fish.…”

“…Neem water extract (stock solution) was prepared by taking 1 kg of green neem leaves in 2 liters of water, where as turmeric water extract (stock solution) was prepared by using 200 g of each dust dissolved in 2 liters of potable water, boiled for 60 minutes at 90°C, then filtered and cooled, finally make the volume of 500 ml in a measuring dark glass bottle and kept in the refrigerator for bioassay test (Lithi et al,. 2012).…”

Effects of drying technique on the quality of Mola (Amblypharyngodon mola) dried by solar tent dryer and open sun rack dryer

“…Sensory quality of dry Mola obtained from solar tent dryer and open sundry rack was determined by a trained panel of seven-person of students, teachers and staffs of the Department of Fisheries Technology. Panelists recognize every attribute and scored for color, taste, texture, and overall acceptability through hedonic scale as 1-2 "excellent", 3-5 "good", 5-7 "average", 8-10 "Bad" (Lithi et al, 2013).…”

Effectiveness of particle size of selected plant materials as protectants of stored Clarias gariepinus against Dermestes maculatus infestation

“…One of such promising areas is in the use of plantderived pest control agents. The extracts and powdery form of many medicinal plants and spices have been cited as pest control agents for stored grains, legumes and smoked fish [6,16,17,18,19,20,21,22,23,24]. However, the effectiveness of the particle size of the powder of such herbs against dry fish insects and pests has not been widely documented.…”