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Field Evaluation of Kenaf Cultivars and Their Hybrids for Their Reactions to Spiral Borer

Shamsuddin Ahmad
PSO
Breeding Division, Bangladesh Jute Research Institute, Manikmia Avenue, Dhaka-1207, Bangladesh.

Ahsanul Haque
SO
Entomology Division, Bangladesh Jute Research Institute, Manikmia Avenue, Dhaka-1207, Bangladesh.

A.K.M. Faruquzzaman
SSO
Entomology Division, Bangladesh Jute Research Institute, Manikmia Avenue, Dhaka-1207, Bangladesh.

M. Hussain
SSO
Breeding Division, Bangladesh Jute Research Institute, Manikmia Avenue, Dhaka-1207, Bangladesh.

M.A. Hossain
SSO
Agronomy Division, Bangladesh Jute Research Institute, Manikmia Avenue, Dhaka-1207, Bangladesh.

Abstract/ Executive Summary:

Out of eight kenaf (H. cannabinus L.) cultivars assessed under field conditions against spiral borer (Agrilus acutus Thumb.) two were rated resistant, one was moderately resistant, three were moderately susceptible and two were susceptible. Among the hybrids progenies one was rated resistant, two were moderately resistant, one was moderately susceptible, two were susceptible and one was highly susceptible. Among resistant cultivars and hybrids, differences in mean gall length were insignificant, however, in percent infestation and mean percent damage (APD), the differences were significant.

Keywords: Kenaf, Resistance, Susciptable, A. acutus

Location: In the field of central station of Bangladesh Jute Research Institute.

Start Date: 30-11-1997

End Date: 30-11-1999

Program Area: Variety and Species

Commodity: kenaf

Objectives:

To assess the field resistance of Kenaf cultivars and their F₁s to A. acutus.

Methodology:

Experiments were conducted in the field of central station of Bangladesh Jute Research Institute (BJRI) during 1998-2000. Eight cultivars of kenaf (two recommended HC-95 and HC-2 and six exotic) and seven F1 hybrids were used. Untreated seeds were sown during 15-30 March in different years in plots (3 x 1.2m2) established in a randomized compete block design having 5 rows. Each row was 3 m with 30 cm spacing. Each treatment was replicated 3 times. Recommended doses of fertilizer (N-P-K = 40-50-20kg/ha) were applied and standard cultural practices were followed but no pesticides were used. About 260 plants from the middle three rows in each plot were checked monthly to record the percent infestation. Percent of plant damage due to gall formation were also recorded from the same plants. Based on the amount of plant damage (mean damage%), the tested materials were rated for their reactions to the pest for use in identifying levels of resistance following Ahmed and Faruquzzaman (2000). The percentage of plant infestation (PPI) and amount of plant damage (APD) were computed according to the formula used by Pradhan (1988) with slight modification. Instead of considering the term percent of plant damage (PPD) as used by Pradhan, percent plant infestation (PPI) and instead of amount of damage (AD), amount of plant damage (APD) were used.

PPI= (Number of plants infested/Number of plants observered) × 100P

APD= (Extent × Intensity) / 100

Where, extent= PPI, intensity= mean gall length.

Source of Information: Online Journal of Biological Science 1 (12): 1158-1160, 2001

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Significant differences were observed among kenaf cultivars and their hybrids with regard to mean percent infestation, mean gall length and mean amount of plant damage (APD). None of these cultivar were free from borer infestation.Of, eight cultivars, two were recorded resikstant, one was moderately resistant. among resistant cultivar and hybrids, differences in mean gall length were insignificant, however, in percent infestation (PPI) and mean percent damage (APD), the differences were significant. It was found that, resistance against spiral borer in kenaf did not follow Mendelian rule and the level of resistance are also weak.

Knowledge Management: Journal