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Further Studies on the Efficacy of Benzoic Acid for Controlling Uzifly Infestation on Silkworm

A Nahar
BSRTI, Rajshahi

A C Barman
BSRTI, Rajshahi

Abstract/ Executive Summary:

An attempt was carried out to observe the efficiency of benzole acid as an ovicide of the uzifly, Trichology bombycis Beck. Applications in three different concentrations viz, 0.5%, 1.0% and 1.5% showed that higher doses were more effective in killing the uzi eggs even at one spray just after egg laying. Highly significant (P.<0.1) effect was recorded in the infestation and cocooning rate when compared to control. Spray of benzoic acid,solution on the silkworm larvae did not hamper normal growth and physiology of the silkworm.

Keywords: Mulberry, Efficacy, benjoic acid

Location: Bangladesh Sericulture Research and Training Institute

Start Date:

End Date:

Program Area: Pest Management

Commodity: Silkworm

Objectives:

This experiment attempts are concentrated to screen out suitable and effective doses which were not mentioned in the previous studies.

Methodology:

Benzoic acid, an organic acid in crystalline powder form was first diluted with methanol and then with distilled water (w/v) at three different concentrations viz. 0.5%, 1.0%, 1.5%. 4th and 5th instar silkworms were infested with uzi eggs inside the u/.illy culture cases, separated from the non-infested ones and grouped into five batches each comprising 100 worms. Four different treatments and a control were maintained for all the doses. The treatments were: T1 = Once just alter eggs laying. T2 = Once after 24 hrs. of eggs laying. T3 = Once in every day. T4 = Once in every alternate day. TO = Non treated control. Different concentrations of benzoic acid solution were uniformly sprayed on the pre-infesled silkworms as per schedule normal feeding and maintained upto spinning to observe the effect of treatment. Normally u/ifly eggs after hatching, the maggot enters into the body of silkworm leaving a black lession on the surface. The number of black lession present on the body of both treated and non-treated silkworm was recorded. Finally, observations on infestation rate, cocooning rate, average cocoon weight and Av. shell weight were separately noted, for each treatment and doses. The experiment was repeated in three different seasons.

Source of Information: Bulletin of Sericulture Research 1993 vol4:45-48 Published by Bangladesh Sericulture Research and Training Institute.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present experiment resulted 2.66-4.00% Westation against 69.33-86.00% in the control which support above result. While the commercial "uzicide" (chemical composition unknown)spray in India recorded 1.16% average infstatioin compared to 16.24% in the untreated batches (Pradip Kumar el ai, 1987). In India, benzoic acid (1%) was used in every alternate day (Anon, 1990). The present work suggests two more alternatives i.e., only once just after egg laying or once in every day. The uzifly after oviposition, hatch out in 1-2 or 3-4 days depending on the prevailed temperature. At 25°C, hatching may take place within 30 hrs. Below 20°C it would require 2-3 days or more. As such, when temperature goes above 25°C then benzoic acid should be sprayed every day to get better result. But if it is below 25°C then spray may be done in every alternate day.Further investigations on large scale application and economics are in progress.

Knowledge Management: Journal