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Assessment of Loss Caused by Top Shoot Borer (scirpo-phaga Excerptalis Walk) and Stem Borer (chilo Tumi-dicostalis Hamps. and Chilo Auricilius Dudgeon)

M. A. Hamid Miah
Sugarcane Research Institute, Ishurdi, Pabna. Bangladesh.

A. K. M. Qudrat-E-Khuda
Sugarcane Research Institute, Ishurdi, Pabna, Bangladesh

Abu Zahangir Khan
Sugarcane Research Institute, Ishurdi, Pabna, Bangladesh

M. Shahjahan
Sugarcane Research Institute, Ishurdi, Pabna, Bangladesh

Abstract/ Executive Summary:

An experiment on assessment of loss caused by Top Shoot Borer (Scirpophaga excerptalis Walk.) and Stem Borers (Chilo tumidicostalis Hampson and Chilo auricilius Dudgeon) was carried out. The Top Shoot Borer (TSB) infested canes contain 2% less sucrose than the Stem Borer (SB) infested canes. It would be economic if the control measures are taken when there are 5% infestations by each of TSB and SB in respect of the cane weight and sucrose content together. When the cane weight is alone considered, it would not be economic to engage labourers if SB and TSB infestations are below 20% and 10% respectively. Thus it is suggested that mechanical control operation would be profitable to keep infestation below economic injury level.

Keywords: Loss caused, Top shoot Brer and Stem Borer

Location: Sugarcane Research Institute (SRI) experiment farm, Ishurdi, Pabna

Start Date: 00-01-1980

End Date: 00-05-1980

Program Area: Pest Management

Commodity: Insects, Sugarcane

Objectives:

To describes the damage caused by SB and economic injury level of 5B & TSB.

Methodology:

The experiment was conducted at Sugarcane Research Institute (SRI) experiment farm, Ishurdi, Pabna during January to May 1980. Ten infested and non infested plants of several commercially cultivated sugarcane varieties were weighed and crushed individually and sugar recovery studied with polarimeter. The decrease in cane weight and sucrose content of these varieties cultivated at Sugarcane Research Institute (SRI) experiment farm was recorded. 5% infestation level differs with varieties the loss of cane was calculated.

Source of Information: Bang. J. Sug.-Cane, Vol. 2, pp: 13-17, 1980

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Loss of TSB and SB may be termed as two dimensional because the infestation reduces yield as well as the sucrose content. Moreover, the rate of reduction varies with the intensity of attack as well as the tolerance which is an important component of varietal resistance, Loss caused to the severaI cane varieties by SB and TSB reported earlier which showed that on an average 2% sucrose is reduced by Top Shoot Borer. Therefore, it was apparent that TSB was more damaging. than the other if infested at later stage of growth. The farmers fields of Carews & Co. Darsana, that 80% canes were infested by several plant boring insects (personal observation). In such a case, the grower may apprehend a minimum loss of 48 mds of canes/acre which would be equal to Tk. 576/-. Since Top shoot borer infested canes had about 2% less sucrose, production of sugar from one acre of such heavily infested cane field would be reduced by a factor, 24.3%.The profit of pest control measures and the economic threshold of adopting plant protection measures vary with the several inputs are the different countries. In Bangladesh mechanical control measures for SB & TSB are usually followed, which require during one crop season 10 labourers for one acre of land. The benefit of farmer alone is considered, then the grower may not apparently be benefited by engaging labourers if SB & TSB infestations are below 20% and 10% respectively towards the end of the season. But the infestation towards the end resulted from the infestation during the earlier part of the season. Therefore, mechanical control would pay in the long run because pest control operation, in stead of increasing the yield saves the loss of yield which would otherwise have occurred owing to pest attack. Thus it is suggested that mechanical con.rot operation in the early stage of plant growth would be profitable to keep infestation below economic injury level.

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