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Development of Biorational-based Integrated Pest Management Package Against Pod Borer, Helicoverpa Armigera Hubner Infesting Chickpea

M. Mahmudunnabi
Scientific Officer
Entomology Division, BARI, Gazipur-1701

A. K. M. Z. Rahman
Senior Scientific Officer
Entomology Division, BARI, Gazipur-1701

N . K. Dutta,
Senior Scientific Officer
SSO, Entomology Division, BARI, Gazipur-1701

Abstract/ Executive Summary:

Chickpea, (Cicer arietinum L.) is an important pulse crop world-wide. There are many constraints in the production of the crop, of which pod borer, Helicoverpa armigera Hubner is the notorious one which causes both quantitative and qualitative loss. Therefore, an experiment was conducted during rabi 2012-13 to evaluate different biorational based IPM packages viz., IPM package 1 (P1) comprising pheromone trapping of H. armigera along with sequential release of biocontrol agents (Trichograma evanescens @ gm/ha/week + Bracon hebetor @ 1 jar (1000-1200 adults)/ha/week) and spraying of Bacillus thuringiensis (Bt) @ 0.4g/ litre of water; IPM package 2 (P2) consists of pheromone trapping in addition to sequential release of bio-control agents and spraying of Helicoverpa nuclear polyhedrosis virus (HNPV) @ 0.1g/litre of water against this pest attacking chickpea. Results indicate that the IPM package (P2) revealed the best performance reducing 68.20% pod damage over control and provided significantly the highest yield (1832.20 kg/ha). Consequently, the highest benefit cost ratio (BCR) (2.11) was also recorded from this package. Hence, biocontrol agent release along with installation of sex pheromone traps and spraying of HNPV may be recommended for effective management of pod borer attacking chickpea.

Keywords: Chickpea pod borer, HNPV, Bt, IPM

Location: Gazipur

Start Date: 10-09-2012

End Date: 05-04-2013

Program Area: Pest Management

Commodity: Chickpea

Objectives:

To evaluate the efficacy of different biorational based IPM package (s) against chickpea pod borer.

Methodology:

The experiment was conducted at Entomology division, BARI, Gazipur, during Rabi 2012-13 to evaluate different biorational based IPM packages against pod borer infesting chickpea. The treatments were: IPM package 1 (P1) [sex pheromone trapping + sequential release of biocontrol agents (Trichograma evanescens + Bracon hebetor) + spraying of Bt @ 0.4g/ litre of water], IPM package 2 (P2) [sex pheromone trapping + sequential release of biocontrol agents (Trichograma evanescens + Bracon hebetor) + Spraying of HNPV @ 0.1g/litre of water] along with the farmers practice (P3) [spraying of Nitro 505 EC (Cypermethrin+Chlorpyriphos) @ 2ml/litre of water] and an untreated control. The experiment was laid out in a randomized complete block design with three replications (dispersed). The treatments were randomly allotted in each block. The unit plot size was 8m x 4m. The seeds of BARIchola-5 were sown on November 15, 2012 in rows with a spacing of 50 cm. Plant to plant distance was maintained at 10 cm. Standard agronomic practices were followed as recommended. Sex pheromone traps were installed in the experimental field at 45 days after sowing (DAS) maintaining 25 m distance among the traps. Sex pheromone lures of H. armigera were placed in BARI developed water traps for capturing adult moths. The pheromone traps were placed just above the crop canopy by means of bamboo support. The traps were kept in the chickpea field throughout the cropping season. Treatment wise sequential release of bio control agents (T. evanescens @ gm/ha/week + B. hebetor @ 1 jar (1000-1200 adults)/ha/week) was started at flowering stage and continued up to pod maturity stage. Spraying of HNPV @ 0.1g/litre of water, Bt @ 0.4g/ litre of water and Nitro 505EC (Cypermethrin + Chlorpyriphos) @ 2ml/litre of water were done twice at an interval of 7 days starting from pod formation stage. At maturity, all the pods were collected from 10 randomly selected plants from middle rows of each plot and examined. The damaged (bored) and total numbers of pods were counted and the per cent pod damage was determined using the following formula: % Pod damage = Number of damaged pods/ Total number of pods x 100

Source of Information: J. Biopest 6(2): 108-111

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The total number insecticide brands of five different groups was 59 from four different locations and 78 % of the tested brands were found more than 90% pure in term of AI presence. The purity range of about 10% of the total tested brands was 80%-90%. The remaining 12% were less than 80 % pure, two brands of which contained no AI at all.

Knowledge Management: Journal