Pest Management: Symptoms
Maize - Stem borer: Chilo partellus
- Symptoms of Damage:
Central shoot withers and leading to dead heart.
Larvae mines the midrib enter the stem and feeds on the internal tissues.
Bore holes visible on the stem near the nodes
Young larva crawls and feeds on tender folded leaves causing typical shot hole symptom
Affected parts of stem may show internally tunnelling caterpillars
- Identification of Pest:
Larva - Yellowish brown with a brown head
Adult - Moth is medium size, straw coloured
Sow the lab or cowpea as an intercrop (Maize Lablab 4:1)
Set up light trap till midnight to attract and kill the stem borer moths.
Collect the stubbles after harvest and burn to destroy diapausing borers
Mix any of the following granular insecticides with sand to make up a total quantity of 50 kg and apply in the leaf whorls on the 20th DAS
Phorate 10% CG10 kg/ha
Carbaryl 4% G 20 kg/ha.
Carbofuran 3G @17 kg (500 lit. spray fluid/ha)
For stem borer, release egg parasitoid Trichogramma chilonis @2,50,000 /ha coinciding egg laying period. Three releases at weekl
If granular insecticides are not used, spray any one of the following
Carbaryl 50 WP 1 kg/ha on the 20th day of sowing (500 l of spray fluid/ha)
Dimethoate 30% EC 660 ml/ha
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