by: Kanika SohaneyPosted on:

Fruit borer

Fruit borer:  Helicoverpa armigera

Management:

  • ETL: One egg or one larva/plant

Monitoring:

  • Pest monitoring should be intensified at farm, village and state level by using light traps, pheromone traps and in situ assessments by roving and fixed plot surveys. For management, an action threshold of one egg/plant or 1 larva/plant may be adopted.

Cultural practices:

  • Synchronised sowing of cotton preferably with short duration varieties in each cotton ecosystem
  • Avoid continuous cropping of cotton both during winter and summer seasons in the same area as well as ratooning
  • Avoid monocropping. Growing of less preferred crops like greengram, blackgram, soyabean, castor, sorghum etc., along with the cotton as intercrop or border crop or alternate crop to reduce the pest infestation
  • Removal and destruction of crop residues to avoid carry over of the pest to the next season, and avoiding extended period of crop growth by continuous irrigation
  • Optimising the use of nitrogenous fertilizers that will not favour moth multiplication of the pest
  • Judicious water management for the crop to prevent excessive vegetative growth and larval harbourage

Biological control:

  • Application of Nuclear Polyhedrosis Virus (NPV) at 3 x 1012 POB /ha in evening hours at 7th and
12th week after sowing
    • Bacillus thuringiensiskurstaki 750-1000 g/ha
    • Bacillus thuringiensisserovarkurstaki (3a, 3b, 3c) 5%WP 500-1000 g/ha
    • Beauveriabassiana1.15% WP 400 g/ha
    • Conservation and augmentation of natural predators and parasitoids for effective control of the pest.
    • Inundative release of egg parasitoid, Trichogrammaspp., at 6.25 cc/ha at 15 days interval 3 times from 45 DAS
    • Egg-larval parasitoid, Chelonusblackburniiand Predator Chrysoperlacarneaat 1,00,000/ha at 6th, 13th and 14th week after sowing.
    • ULV spray of NPV at 3 x 10 12 POB /ha with 10% cotton seed kernel extract, 10% crude sugar, 0.1% each of Tinopal and Teepol for effective control of Helicoverpa
    Note: Dicofol, methyl demeton, monocrotophos and phosalone are comparatively safer to Chrysoperlalarva
recording low egg mortality

Chemical control:

  • Discourage the indiscriminate use of insecticides, particularly synthetic pyrethroids
  • Use of proper insecticides that are comparatively safer to natural enemies such as phosalone at the correct dosage and alternating different groups of insecticides for each round of spray
  • Avoid combination of insecticides as tank mix
  • Adopt proper delivery system using spraying equipments like hand compression sprayer, knapsack sprayer and mist blower to ensure proper coverage with required quantity of spray fluid and avoid ULV applications or Akela spray applications
  • Proper mixing and preparation of spray fluid for each filling of spray fluid tank

At early stages of square formation apply one of the following insecticides

Acephate 75% SP 780 g/ha Flubendiamide 39.35% SC 100-125 ml/ha
Azadirachtin 0.03% EC 500 ml/ha Indoxacarb 14.5% SC 500 ml/ha
Carbaryl 
10% DP 25 kg/ha Lufenuron 5.4% EC 600 ml/ha
Chlorantraniliprole 18.5% SC 150 ml/ha Novaluron 10% EC 1000 ml/ha
Chlorpyriphos 20% EC 1250
ml/ha NPV of H. armigera0.43% AS 400-600 ml/ha
Diflubenzuron 25% WP 300 g/ha Profenofos 50% EC 1750-2500 ml/ha
Emamectin benzoate 5% SG 190-220 g/ha Pyridalyl10% EC 1500-2000 ml/ha
Fipronil 5% SC 2000 ml/ha Spinosad 45.0% SC 165-220 ml/ha
Flubendiamide 20% WG 250 g/ha Thiodicarb 75% WP 1000 g/ha

During bolling and maturation stage, apply any one of the following insecticides (1000 l of spray fluid/ha):

  • Quinalphos 25 EC 2.0 l/ha
  • Carbaryl 50 WP 2.5 kg/ha
  • Pyraclofos 50 EC 1.5 l/ha.

 

Source-

  • TamilNadu Agritech Portal
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