BIOLOGICAL CONTROL OF PEST

Presented To:- Presented By:-Dr. Paras Nath Md. Mahtab RashidDr. S.B. Shah BPSAC/21/2012-2013

B.Sc.(Ag) 4th Semester

Defination

Successful management of a pest by means of another living organism that is encouraged and disseminated by man

• Advantages a. Reduces pest population below economic damage level b. Useful for low value crops

It is the deliberate introduction and establishment of natural enemies to a new locality where they did not occur or originate naturally. When natural enemies are successfully established, it usually continues to control the pest population.

It is also called classical biological control

INTRODUCTION

Rearing and releasing of natural enemies to supplement the numbers of naturally occurring natural enemies

2 approaches i. Inundation-applying a living insecticide ii. Inoculation-control by progeny and subsequent generations

AUGMENTATION

Actions to preserve and release of natural enemies by environmental manipulations

Non use of those pest control measures that destroys natural enemies

CONSERVATION

1. PARASITES:- Organisms smaller than the host and a single individual completes its life-cycle on one or many pests but doesn’t kill them a. Ectoparasites b. Endoparasites2. PARASITOIDS:- Insect parasites parasitic only in immature stages and destroys its host in the process of development but free living as an adult

BIO-CONTROL AGENTS

3. PREDATORS:- It catches and devours smaller animals by killing them in getting a single meal. It is free living throughout its life cycle

Cottony cushion scale vs Vedelia Beetles Control of cottony cushion scale, Icerya

purchasi on fruit trees by its predatory vedalia beetle, Rodolia cardinalis in Nilgiris. The predator was imported from California in 1929 and from Egypt in 1930 and multiplied in the laboratory and released. Within one year the pest was effectively checked

CASE STUDY No. 1

For the biological suppression of Water Fern, Salvinia molesta, the weevil, Cyrtobagous salviniae, was imported from Australia in 1982. Exotic weevil, C. salviniae was released for the control of water fern, S. molesta in a lily pond in Bangalore in 1983-84. Within 11 months of the release of the weevil in the lily pond the salvinia plants collapsed and the lily growth, which was suppressed by competition from salvinia resurrected.

CASE STUDY No. 2

Biological Control of Water Hyacinth, Eichhornia crassipes ,three exotic natural enemies were introduced in India viz.,hydrophilic weevils – Neochetina bruchi and N. eichhorniae ( Argentina) and galumnid mite Orthogalumna terebrantis (South America) in 1982 for the biological suppression of water hyacinth.

CASE STUDY No. 3

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