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Crop Protection

Crop Protection
29
Jul

Menochilus sexmaculatus (Fabricius)

 

Class: Insecta
Order: Coleoptera
Family: Coccinellidae
Genus : Menochilus
Species : sexmaculatus
Common Name : lady beetle

File Courtesy: 
file:///G:/Beneficials/Scientific_name_Menochilus_sexmaculatus_Fabricius_9.htm
Photo Courtesy: 
file:///G:/Beneficials/Scientific_name_Menochilus_sexmaculatus_Fabricius_9.htm
29
Jul

Description of Harmonia octomaculata

Economic importance : Generalist predator.

Hosts : Leafhoppers, planthoppers, aphids, and leaffolders.

Description:

  1. Harmonia octomaculata is a black-spotted lady beetle. It is reddish brown. Each front wing. or elytron has five black spots and the pronotum has one to two pairs of quadrate to sub- ovate black spots.
  2. It has black legs with reddish yellow tibiae and tarsi.
  3. The spotted lady beetle measures 6 to 7 mm long.

Biology and ecology:

File Courtesy: 
file:///G:/Beneficials/Scientific_name_Harmonia_octomaculata_Fabricius_7.htm
29
Jul

Harmonia octomaculata

 

Class: Insecta
Order: Coleoptera
Family: Coccinellidae
Genus : Harmonia
Species : octomaculata

File Courtesy: 
file:///G:/Beneficials/Scientific_name_Harmonia_octomaculata_Fabricius_7.htm
Photo Courtesy: 
file:///G:/Beneficials/Scientific_name_Harmonia_octomaculata_Fabricius_7.htm
25
Jul

Bioecology of Green- horned caterpillar

Bioecology of Green- horned caterpillar  

  • The green horned caterpillars adults are large butterflies and are easily recognized because of the pattern of eye spots on their wings.
  • Larvae are yellow-green and have two pairs of horns on the flat and square head and posterior end of the body.
  • The body is covered with small and yellow bead-like hairs. Melanitis has white or black horns and Mycalesis has red horns.
File Courtesy: 
Field management of insect pests of rice - A ready reckoner. Technical Bulletin No.46, Directorate of Rice Research, Rajendranagar
Photo Courtesy: 
Mr.Y.Kondal Rao (DRR)
25
Jul

Taxonomy of Green- horned caterpillar

Taxonomy of Green- horned caterpillar

Class: Insecta

Order: Lepidoptera

Family : Satyridae

Genus : Melanitis

Species : leda ismene

File Courtesy: 
Field management of insect pests of rice - A ready reckoner. Technical Bulletin No.46, Directorate of Rice Research, Rajendranagar
Photo Courtesy: 
Dr.Chitra Shanker
25
Jul

Insect pests of minor significance

Insect pests of minor significance

The insect pests of minor significance are as follows:

1. Green- horned caterpillar

2. Rice skipper

3. Green semilooper

4. Grass hoppers

5. Whorl maggot

File Courtesy: 
Field management of insect pests of rice - A ready reckoner. Technical Bulletin No.46, Directorate of Rice Research, Rajendranagar
25
Jul

Management of Cut worm

Management of Cut worm

Cultural control: Keeping fields flooded may keep population of this pest at low levels.

Biological control: Biological control agents of cutworm are very abundant. For example, scelionid and braconid wasps are egg parasitoids and grasshoppers are predators of the pest. Fungal and polyhedrosis viruses are pathogens that attack this insect pest.

File Courtesy: 
Insect Pests of Rice by M. D. Pathak and Z. R. Khan
25
Jul

Nature of Damage of Cut worm

Nature of Damage of Cut worm  

File Courtesy: 
Insect Pests of Rice by M. D. Pathak and Z. R. Khan
25
Jul

Host Range of Cut worm

Host Range of Cut worm

Climbing cutworm is a polyphagous insect and has been recorded as a serious pest of Rice, Wheat, Oats, Barley, and other cereals and also infests grassy weeds, while the common cutworm is reported on Lettuce, Cabbage, Beetroot, Peanuts, Geranium, Cotton, Banana, Sorghum, Sugarcane, Tomatoes, Asparagus, Apple and Eggplant.

File Courtesy: 
Insect Pests of Rice by M. D. Pathak and Z. R. Khan
25
Jul

Bioecology of cut worm

Bioecology of cut worm

Mythimna seperata (Climbing cut worm):

File Courtesy: 
Insect Pests of Rice by M. D. Pathak and Z. R. Khan
Photo Courtesy: 
CRRI
25
Jul

Taxonomy of Cut worm

Taxonomy of Cut worm

Order: Lepidoptera

Family: Noctuidae

Genus: Spodoptera

Species: litura

Genus: Mythimna

Species: seperata

File Courtesy: 
Insect Pests of Rice by M. D. Pathak and Z. R. Khan
Photo Courtesy: 
Dr.Chitra Shanker
25
Jul

Chemical control of Armyworm/Swarming caterpillar

Chemical control of Armyworm/Swarming caterpillar

1. Chemical control may be needed when populations are extremely high.

2. The dosage should be adjusted based on the average size of the larvae.

3. Spraying should be done in the late afternoon just before the larvae climb up for feeding.

4. The damage is generally patchy and hence spray can be directed mostly on affected regions

File Courtesy: 
Insect Pests of Rice by M. D. Pathak and Z. R. Khan
Photo Courtesy: 
Mr.M.Mohan
25
Jul

Biological control of Armyworm/Swarming caterpillar

Biological control of Armyworm/Swarming caterpillar

Armyworms are held in check by egg and larval parasites. When these parasites fail, usually because of drought, armyworms become epidemic

1. Parasitoids such as Trichogrammatids, Scelionids, tachinids, ichneumonids, eulophids, chalcids, and braconid wasps parasitize this pest.

2. Ants, birds and toads feed on the pest. Fungal diseases and a nuclear polyhedrosis virus also infect the larvae.

File Courtesy: 
Insect Pests of Rice by M. D. Pathak and Z. R. Khan
Photo Courtesy: 
Mr.M.Mohan
25
Jul

Nature of Damage of Armyworm/Swarming caterpillar

Nature Of Damage of Armyworm/Swarming caterpillar

The swarming caterpillars cause severe damage to rice plants in nursery beds. They appear suddenly in masses and move like an army from field to field so that seedbeds or the direct seeded fields look as if grazed by cattle

1. This is a sporadic pest but causes very serious damage to young crops when it appears in large number.

File Courtesy: 
Field management of insect pests of rice - A ready reckoner. Technical Bulletin No.46, Directorate of Rice Research, Rajendranagar
Photo Courtesy: 
Gajendran, G. Prof.&Head (Crop Protection), Trichy
25
Jul

Host Range and Host Plant Resistance of Armyworm/Swarming caterpillar

Host Range of Armyworm/Swarming caterpillar

  • Rice,
  • Maize,
  • Jowar,
  • Wheat,
  • Barley,
  • Sugarcane and
  • a variety of grasses

Host plant resistance to Armyworm/Swarming caterpillar

  • Several wild rices and a few plant introductions (PI) possess moderate levels of resistance to Spodoptera mauritia
File Courtesy: 
Insect Pests of Rice by M. D. Pathak and Z. R. Khan
25
Jul

Bioecology of Armyworm/Swarming caterpillar

Bioecology of Armyworm/Swarming caterpillar

1. Eggs are laid in masses on leaves and covered with grey hairs.

2. The egg period is 7 days. Caterpillar is cylindrical dark to pale green with lateral lines along the body.

3. The larval period is 20-25 days. It pupates in an earthern cocoon in soil for 10-15 days.

File Courtesy: 
Insect Pests of Rice by M. D. Pathak and Z. R. Khan
Photo Courtesy: 
Mr.Y.Kondal Rao (DRR)
25
Jul

Distribution of Armyworm/Swarming caterpillar

Distribution of Armyworm/Swarming caterpillar

  • Bihar,
  • Punjab,
  • Uttar Pradesh,
  • Orissa,
  • Madhya Pradesh and
  • Tamil Nadu
File Courtesy: 
Field management of insect pests of rice - A ready reckoner. Technical Bulletin No.46, Directorate of Rice Research, Rajendranagar
Photo Courtesy: 
CRRI
25
Jul

Taxonomy of Army Worm/Swarming Caterpillar

Taxonomy of Armyworm/Swarming caterpillar

Order : Lepidoptera

Family : Noctuidae

Common name : Armyworm/Swarming caterpillar

Scientific name : Spodoptera mauritia

File Courtesy: 
Integrated Pest management in Rice, Technical bulletin No. 15, DRR, Rajendranagar, Hyderabad
Photo Courtesy: 
Mr.Y.Kondal Rao (DRR)
25
Jul

Cultural and Chemical Management of Rice Thrips

Cultural Management of Rice thrips  

  • Flooding to submerge the infested field for 2 days as a cultural control practice is very effective against the rice thrips

Chemical Management of Rice thrips

File Courtesy: 
Field management of insect pests of rice - A ready reckoner. Technical Bulletin No.46, Directorate of Rice Research, Rajendranagar
25
Jul

Host plant resistance for Rice thrips

Host plant resistance for Rice thrips  

File Courtesy: 
Insect Pests of Rice by M. D. Pathak and Z. R. Khan
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