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Efficacy of Different Egg and Larval Parasotoids for the Control of Leaf Eating Insect Pests of Cabbage in Micro Plots

S. N. Alam
Principal Scientific Officer
Entomology Division, BARI, Gazipur

M.A. Sarkar
Senior Scientific Officer
Entomology Division, BARI, Gazipur

M. Mahmudunnabi
Scientific Officer
Entomology Division, BARI, Gazipur

Abstract/ Executive Summary:

Parasitism efficiency of three species of egg parasitoid, Tricogramma chilonis, T. evanescens and Trichogrammatidae bactrae was studied against leaf eating caterpillars of cabbage in micro plot condition. Result indicated that all the three species of Tricogramma significantly parasitised both the caterpillar’s eggs but parasitism percentage was higher in T. chilonis than T. evanescence. Parasitism of S. litura eggs was less than the diamond back moth eggs. Joint effort of egg and larval parasitoid had significant effect on the reduction of leaf eating caterpillars in cabbage.

Keywords: Cabbage, leaf eating caterpillars,Tricogramma chilonis, T. evanescens and Trichogrammatidae bactrae

Location: Gazipur

Start Date: 10-11-2008

End Date: 27-02-2010

Program Area: Pest Management

Commodity: Cabbage

Objectives:

To verify the effect of different natural enemies, especially egg and larval parasitoids for their innundative release in the field to fill up the gaps of natural enemies.

Methodology:

Ten cabbage heads were covered with 70 meshes net (1.5 x 1.5m) at 30 days after transplanting. Four pairs of newly hatched male and female DBM and two pairs of Spodoptera litura adults were released in the micro plots after 20 days of the net setting. After 2 days of pest insect release both the species of egg parasitoid Tricogramma were released within the micro plots. Two sets of experiments were set, in one set only egg parasitoids were evaluated and in other set both egg + larval parasitiods were studied. There were four treatments/set, i) release of pests + T. chilonis, ii) release of pests + T. evanescense, iii) release of pests + T. bactrae, and iv) only pests release. In another set joint efficacy of both the egg and larval parasitoids were determined, where the treatments were, i) release of pests + T. chilonis+ Bracon hebetor, ii) release of pests + T. evanescense + Bracon hebetor, iii) release of pests + T. bactrae + Bracon hebetor, and iv) only pests release. At 10 days after release of parasitoids, the nets were removed and the total number of DBM and Spodoptera larvae per head were counted and recorded.

Source of Information: Annual Report 2008-2009, Entomology Division, BARI, Gazipur

Article Link (Online Journal):

Funding Source:

1.	Budget: 50,000.00

Total Budget (Tk.) : 50,000.00

Achievement/Findings:

All the three species of Tricogramma significantly parasitised both the caterpillar’s eggs but parasitism percentage was higher in T. chilonis than T. evanescens. Parasitism of S. litura eggs was less than the diamond back moth eggs. Joint effort of egg and larval parasitoid had significant effect on the reduction of leaf eating caterpillars in cabbage.

Knowledge Management: Report/Proceedings