Measures to Control Leaf Webber pest in Cabbage Crop

The leaf webber (Crocidolomia binotalis) is a moth larva that is a major pest of cabbage crops. It is native to India and Southeast Asia, but has now spread to many other parts of the world. The larvae feed on the leaves of cabbage plants, webbing them together and creating holes. This can damage the plants and reduce yields.

• • Type of Infestation: Pest
  • Common Name: Leaf Webber
  • Causal Organism: Crocidolomia binotalis
  • Affected Parts Of the plant: Leaves

Identification:

Eggs:

• Tiny, oval-shaped, and initially yellowish-white, turning pinkish later.

Larvae (caterpillars):

• Early instars: Green with a brown head and longitudinal stripes.
• Later instars: Develop distinctive redheads and brown longitudinal stripes with rows of tubercles on their bodies.
• Grow up to 25-30mm long when fully mature.

Pupae:

• Formed within thin, silken cocoons spun among webbed leaves.
• Initially green, turning brown later.

Adults:

• Small moths with light brownish forewings and pale white triangular markings.
• Wingspan of around 20-25mm. 

Environmental favorable factors for pests/Diseases:

• Temperature: Leaf Webbers thrive in warm weather, with optimal temperatures for development and reproduction ranging from 25°C to 30°C (77°F to 86°F). They are less active and have slower development below 18°C (64°F) and above 35°C (95°F).
• Humidity: High humidity levels (above 70%) favor the survival and development of Leaf Webbers, as it prevents their eggs and larvae from drying out.

Symptoms of Pest/Disease:

• Webbed leaves: The larvae will spin webs to protect themselves from predators and the environment.
• Holes in the leaves: The larvae will eat the leaves of the cabbage plant, creating holes.
• Stunted growth: The damage caused by the larvae can stunt the growth of the cabbage plant.
• Reduced yields: If the infestation is severe, it can reduce the yield of cabbage plants.

Measures to control Pests/Diseases: