Best Drupal HostingBest Joomla HostingBest Wordpress Hosting

Economic Threshold Levels of Insect Pests

A decision to use an insecticide should be made only when an insect population has reached or exceeded an economic threshold—that level of a pest population at which control is needed to prevent economic loss (that is, the projected cost of damage is greater than the cost of control).The utmost principles of an insect management program are scouting fields and basing control decisions on economic thresholds. Growers should incorporate scouting and the use of economic thresholds into their crop management plans. Economc thresholds of insect pests of General Crops, Vegetables & Orchards are given as under:

Wheat

         

Mango

   
                 
Brown Leaf Rust   % Incidence & Low-Med-High Intensity         Hopper  
5/ Leaf (In Summer)1/ Leaf (In Winter)10/ Inflorescence or Twig
                 
Smut   % incidence       Scales   50 Scales / Leaf
                 
Armyworm   On Appearance       Fruit Fly   10% Damage
                 
Aphid   No Spray recommended       Mealy Bug   On Appearance
                 
Helicoverpa   No Spray recommended       Mango Midges   10 spots/ Twig or Inflorescence
                 

Gram

          Gall Farming Insect       10 Galls / Leaf
                 
Armyworm   On Appearance       Malformation   Low-Med-High
                 
Helicoverpa   3 Larvae/25 plants       Anthracnose   On Appearance
                 
Termite   10% damage      

Citrus

   
                 
Cutworm   10% at initial stage       Citrus Psylla   6/ Leaf
                 
Blight   Low-Med-High       Leafminer   10% affected leaves
                 
Wilt   % incidence        Fruit Fly   10% affected fruits
                 

Sugarcane

          Withertip   Low-Med-High
                 
Top Borer   10% Attacked Plants       Canker   Low-Med-High
                 
Stem Borer   -do-      

Vegetables

   
                 
Root Borer   -do-       Red Pumpkin Beetle  
1/ 10 Plants (at seedling stage)
1/ Plants (at crop stage)
                 
Gurdaspur Borer   -do-       Hudda Beetle   4/ Plant
                 
Pyrilla   3/Leaf       Fruit Borer   10%on Brinjal 5% on Tomato
                 
Black bug   10/ sheath       Diamond Back Moth   3/ Leaf
                 
Whitefly   10/ Leaf       Helicoverpa   5% Fruit Infestation
                 
Mites   10/ Leaf       Fruit Fly   3 % Fruit Infestation
                 
Toka   3-5/ Sweep of Net       Jassid   1/Leaf on Cucurbits, 2/ Leaf on Brinjal,
3/ Leaf on Melons
                 
Mealy Bug   On Appearance      
Whitefly
 
5/Leaf on Cucurbits
2/Leaf on Chillies, Cowpeas
                 
Termites   10% Damage       Aphid   5/Leaf
                 
Rodents   5 Live Burrows/ Acre       Powdery Mildew   Low-Med-High
                 
Diseases   Only Presence       Downy Mildew   Low-Med-High
                 

Maize

          Wilt  
Only Seed Treatment
Shoot fly   5%            
            Root Rot    Only Seed Treatment
Stem borer   5%            
            Collar Rot   Water must not touch the stem
Helicoverpa   5 % Cobs            
            Leaf Spot/ Blight   Spray on appearance
Armyworm   On Appearance            
       

 

 

Cotton

   

Potato

               
            Jassid   1 Adult or Nymph per leaf
Jassid   3/Leaf            
Blight   On Appearance       Whitefly   5 Adult or Nymph or both per leaf
                 

Tobacco

          Thrips    8-10 Adult or Nymph per leaf
                 
Cutworm      3% Attacked Plants       Cotton Mealy Bug   On Appearance
                 

Oilseed Crops

          Mites   10-15 per leaf
                 
Aphid  
1/ Pod10/ Twig
      Spotted Bollworm   3 Larvae/ 25 plants
                 

Sunflower

          Pink Bollworm   5 Larvae/ 100 Bolls
                 
Helicoverpa   1/5 Flowers       Helicoverpa   5 Brown eggs or 3 small larvae or Both 5 / 25 plants
                 

Rice

          Armyworm   On Appearance
                 
Borers  
No. of Moths/Trap/Night  are 8-10 at Crop
Dead Hearts 5 % at Crop
      Aphid   Spray on visible damage on top terminals
                 
Chrotogonous (Toka)
  3-5 Adults/Net            
                 

Guava

               
                 
Fruit Fly   10% Attacked Fruits (4-5 pheromone traps/ acre