Brinjal Fruit and Shoot Borer Control

The brinjal fruit and shoot borer (BFSB), scientifically known as Leucinodes orbonalis, is a very destructive pest for brinjal (eggplant) cultivation in India. The larvae of this moth bore into young shoots and fruits, causing significant yield loss. Effective control relies on a combination of methods rather than just one.

Identifying Brinjal Fruit Borer Damage

Early detection is key to managing this pest. Look for the following signs:

Wilting Shoots: Young shoots may droop and dry up, especially at the growing tips. If you split open a wilting shoot, you will often find a pinkish larva inside.
Holes in Fruits: Small, circular holes on the brinjal fruits, often with frass (larval droppings) visible around the entry point. The larvae tunnel inside the fruit, making it unfit for market.
Larvae: The larvae are usually pinkish-white with a brown head, found inside affected shoots and fruits.

Cultural and Mechanical Control Methods

These methods help reduce pest populations without relying on chemicals:

Field Sanitation: Regularly remove and destroy all infested shoots and fruits from the field. Do not leave them lying around as they can harbor larvae.
Crop Rotation: Avoid planting brinjal or other solanaceous crops (like tomato, potato) in the same field year after year. Rotate with non-host crops.
Timely Planting: Plant brinjal at recommended times to avoid peak pest periods if possible.
Pheromone Traps: Install pheromone traps at a rate of 10-12 traps per acre to monitor and mass-trap male moths, disrupting their breeding cycle. Replace lures every 3-4 weeks.
Hand Picking: In small fields, regularly hand-pick and destroy larvae and eggs, especially from young shoots and leaves.

Biological Control Options

Using natural enemies can be a sustainable way to manage BFSB:

Parasitoids: Release egg parasitoids like Trichogramma chilonis. These tiny wasps lay their eggs inside the pest's eggs, preventing them from hatching. Release 50,000 parasitoids per acre, 4-5 times at weekly intervals, starting from 30 days after transplanting.
Biopesticides: Apply formulations of Bacillus thuringiensis (Bt) var. kurstaki. This bacterium produces toxins that kill the larvae when ingested. Follow manufacturer's instructions for dosage, typically 1-2 kg or litres per acre.

Chemical Control (As a Last Resort)

If the infestation is severe and other methods are not sufficient, chemical insecticides can be used. Always follow safety precautions, wear protective gear, and adhere to recommended dosages and pre-harvest intervals.

Active Ingredient	Formulation	Dosage (per 15 litres water)	Remarks
Emamectin Benzoate	5% SG	8-10 grams	Effective against larvae, relatively safer.
Chlorantraniliprole	18.5% SC	3 ml	Systemic action, good residual effect.
Spinosad	45% SC	7.5 ml	Naturalyte insecticide, effective against borers.

Important: Rotate different classes of insecticides to prevent the development of pest resistance. Do not spray the same chemical repeatedly.

Integrated Pest Management (IPM) Strategy

The most effective way to control brinjal fruit and shoot borer is to combine all these methods into an Integrated Pest Management (IPM) strategy. Start with cultural and mechanical practices, introduce biological controls, and only use chemical sprays when absolutely necessary and economic threshold levels are crossed. Regular monitoring of your crop is crucial to decide which control measure to apply and when.

By adopting a holistic approach that combines good farm practices with biological and judicious chemical interventions, farmers can significantly reduce brinjal fruit and shoot borer damage and achieve healthier, higher-yielding brinjal crops.