TNAU Agritech Portal
Home | About Us | Success Stories | Farmers Association | Farmers' Innovation | Publications | Contact

TNAU Agritech Portal :: Crop Protection

Chilli thrips: Scirtothrips dorsalis

Symptoms of damage
  • The infested leaves develop crinkles and curl upwards
  • Elongated petiole
  • Buds become brittle and drop down.
  • Early stage, infestation leads to stunted growth and flower production, fruit set are arrested
Chilli thrips infestation - upward curling
Chilli thrips infestation - upward curling

Identification of pest
  • Nymphs: Tiny, slender, fragile and straw yellow in colour
  • Adult: with heavily fringed wings
Adult


Management
  • Inter crop with agathi Sesbania grandiflora to provide shade which regulate the thrips population
  •  Do not grow chilli after sorghum – more susceptible to thrips
  •  Do not follow chilli and onion mixed crop – both the crops attacked by thrips
  •  Sprinkle water over the seedlings to check the multiplication of thrips
  • Treat seeds with imidacloprid 70% WS @ 12 g /kg of seed
  • Apply carbofuran 3% G @ 33 kg /ha or phorate 10 % G  @ 10 kg/ha or spray any one of the following insecticide
Insecticide Dose
Imidacloprid 17.8 % SL 3.0 ml/10 lit.
Dimethoate 30 % EC 1.0 ml/lit.
Emamectin benzoate 5 % SG 4 g/10 lit.
Ethion 50 % EC 2.0 ml/lit.
Fipronil 5 % SC 1.5 ml/lit.
Oxydemeton –Methyl 25 % EC 1.0 ml/lit.
Phosalone 35 % EC 2.0 ml/lit.
Spinosad 45 % SC 3.2 ml/10 lit.
Thiacloprid 21.7 % SC 6.0 ml/10 lit.

Top


Green peach aphid: Myzus persicae

Symptoms of damage
  • The infested plants turn pale with sicky appearance.
  • The leaves curled and crinkled
  • Honeydew excrete - development of sooty mould
  • Stunted growth of the plant
Green peach aphid infestation - Crinkling
Green peach aphid infestation - Crinkling

Identification of pest
  • Nymphs initially are greenish, but soon turn yellowish.
  • Adults – yellowish green in colour
Adult
Winged adult
Adult


Management
  • Treat seeds with imidacloprid 70% WS @12 g /kg of seed
  • Apply phorate 10 % G @ 10 kg/ha or spray any one of the following insecticide
Insecticide Dose
Carbosulfan 25 % EC 1.0 ml/lit.
Fipronil 5 % SC 1.0 ml/lit.
Imidacloprid 17.8 % SL 3.5 ml/10 lit.
Oxydemeton –Methyl 25% EC 1.6 ml/lit.
Phosalone 35 % EC 2.0 ml/lit.
Quinalphos 25 % Gel 1.0 ml/lit.
Quinalphos 25 % EC 1.0 ml/lit.

Top



Tobacco cutworm: Spodoptera litura

Symptoms of damage
  • Newly hatched larvae scrap the green matter in the leaf
  • Affected leaf looks like a papery white structure
  • Later instar larvae feed by making small holes
  • In severe infestations they feed voraciously on the entire lamina, petiole and some times
  • even the tender twigs on the terminal shoots of plants.
  • Also feed on the floral parts and bore into the fruits.

Identification of pest
Larva
Larva
Larva
Pupa

Larva

  • Young caterpillars are light green with black head or black spots
  • Gregarious in the early stages
  • Grown caterpillars are grey or dark brown

Adult

  • Forewings – brown colour with wavy white marking
  • Hindwings-  white colour with a brown patch along the margin

Management
  • Plough the soil to expose and kill pupae
  • Castor as a trap crop
  • Set up pheromone trap @ 15/ha
  • Collect and destroy the egg masses, gregarious larvae and grown up caterpillars
  • Spray SINPV @ 1.5*10 12 POB/ha in evening hour
Insecticide Dose
Emamectin benzoate 5 % SG 4 g/10 lit.
Flubendiamide 20 WDG 6.0 g /10 lit.
Indoxacarb 14.5 % SC 6.5 ml/10 lit.
Novaluron 10 % EC 7.5 ml/10 lit.
Spinosad 45 % SC 3.2 ml/10 lit.
Thiodicarb 75 % WP 2.0 g/lit.

Top


Gram caterpillar: Helicoverpa armigera

Symptoms of damage
  • Early instar feeds on foliage
  • Grown up larvae mainly bore into the fruits.

Identification of pest
Larva feeding
Larva feeding
Adult
Adult
  • Eggs – are spherical in shape and creamy white in colour, laid singly
  • Larva - shows colour variation from greenish to brown
  • Pupa – brown in colour, occurs in soil, leaf, pod and crop debris
  • Adult   -   Female brownish yellow stout moth
  • Male – light greenish in colour

Management
  • Collect and destroy the infected fruits and grown up larvae.
  • Setup pheromone trap with Helilure at 15/ha
  • Six releases of T. chilonis @ 50,000/ha per week coinciding with flowering time
  • Release Chrysoperla carnea at weekly interval at 50,000 eggs or grubs / ha from 30 DAS.
  • Spray HaNPV at 1.5*10 12 POB/ha along with cotton seed oil 300 g/ha to kill larvae.
  • Spray carbaryl 50 WP 2 g/lit or B. thuringiensis 2 g/lit
  • Provide poison bait with carbaryl 1.25 kg, rice bran 12.5 kg, jaggery 1.25 kg and water 7.5 lit/ha or spray any one of the following insecticide
Insecticide Dose
Emamectin benzoate 5 % SG 4 g/10 lit.
Flubendiamide 20 WDG 6.0 g /10 lit.
Indoxacarb 14.5 % SC 6.5 ml/10 lit.
Novaluron 10 % EC 7.5 ml/10 lit.
Spinosad 45 % SC 3.2 ml/10 lit.
Thiodicarb 75 % WP 2.0 g/lit.

Top


Yellow mite or muranai mite: Polyphagotarsonemus latus

Symptoms of damage
  • Downward curling and crinkling of leaves
  • Leaves with elongated petiole
  • Stunted growth
Yellow mite infestation - downward curling of leaves
Yellow mite infestation - downward curling of leaves

Identification of pest
  • Oval shaped eggs and white in colour
  • Eggs glued firmly on the leaf surface
  • Nymphs white in colour
  • Adult : large, oval and broad and yellowish in colour
Yellow mite - Adult

Management
  • Encourage the activity of predatory mite: Amblyseius ovalis
  • Apply phorate 10 % G @ 10 kg/ha or spray any one of the following insecticide
Insecticide Dose
Buprofezin 25 % SC 8.0 ml/10 lit.
Chlorfenapyr 10 % SC 1.5 ml/lit.
Diafenthiuron 50 % WP 8.0 g/10 lit.
Dimethoate 30 % EC 1.0 ml/lit.
Ethion 50 % EC 2.0 ml/lit.
Fenazaquin 10 % EC 2.0 ml/lit.
Fenpyroximate 5 % EC 1.0 ml/lit.
Hexythiazox 5.45 % EC 8.0 ml/10 lit.
Milbemectin 1 % EC 6.5 ml/10 lit.
Oxydemeton –Methyl 25 % EC 2.0 ml/lit.
Phosalone 35 % EC 1.3 ml/lit.
Propargite 57 % EC 2.5 ml/lit.
Quinalphos 25 % EC 1.5 ml/lit.
Spiromesifen 22.9 % SC 5.0 ml/10 lit.

Top


Source : www.ars.org, chillithrips.tamu.edu, www.pestnet.org



Home | About Us | Success Stories | Farmers Association | Publications | Contact Us

© 2015 TNAU. All Rights Reserved.