Sweet Corn – Gramophone

How to Control Stem Borer in Sweet Corn

This is the major and more harmful insect of Sweet corn
Central shoot withers and leading to “dead heart”.
Larvae mines the midrib enter the stem and feeds on the internal tissues.
Boreholes are visible on the stem near the nodes.
Young larva crawls and feeds on tender folded leaves causing typical “shot hole” symptom.
Affected parts of the stem may show internally tunneling caterpillars. In the later stage, the plant becomes die.

Control

Mix any one 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 day after sowing.
Phorate 10% G 4 kg/acre or Fipronil 0.3% G 5 kg/acre on 15-20 day after sowing.
If granular insecticides are not used, spray any one of the following:
- Bifenthrin 10% EC @ 200 ml /acre on the 20th day of sowing.
- Fipronil 5% SC @ 500 ml/ acre on the 20 day after sowing.
- Cartap Hydrochloride 50% SP @ 400 gm/acre.

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This is the major and more harmful insect of Sweet corn
Central shoot withers and leading to “dead heart”.
Larvae mines the midrib enter the stem and feeds on the internal tissues.
Boreholes are visible on the stem near the nodes.
Young larva crawls and feeds on tender folded leaves causing typical “shot hole” symptom.
Affected parts of the stem may show internally tunneling caterpillars. In the later stage, the plant becomes die.

Control

Mix any one 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 day after sowing.
Phorate 10% G 4 kg/acre or Fipronil 0.3% G 5 kg/acre on 15-20 day after sowing.
If granular insecticides are not used, spray any one of the following:
- Bifenthrin 10% EC @ 200 ml /acre on the 20th day of sowing.
- Fipronil 5% SC @ 500 ml/ acre on the 20 day after sowing.
- Cartap Hydrochloride 50% SP @ 400 gm/acre.

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In India, about 13.2% of economic yield losses have been reported due to insect-pests attack and disease incidence.
In different agro-climatic zones of our country, this insect has been reported as the cause of loss of 26.7 to 80.4% of the total yield of maize.
Young larvae inter the midrib of the stem and feed the internal tissue and make a shot hole on the stem of the plant. (Causing a condition referred to as “dead heart”).
It damaged the crop from 10-12 DAS to till harvesting.
Soil application of carbofuran 3% G@ 5-7 kg per acre.
The spray of Dimethoate 30% EC@180-240 ml per acre.

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Corn seed should be treated with Carboxin 37.5% + Thiram 37.5% WP @ 2g/kg of seed before sowing.

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Two seeds per hill are dibbled manually or mechanically one third from the top on the side of the ridge.
Excess seedlings should be thinned out 10 days after emergence to have single seedling per hill.

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It needs warm, sunny weather.
The temperatures for optimum germination should be above 18°C.
For optimum growth and quality, the temperature range is from 24°C to 30°C.
Sweet corn requires a well-drained soil with adequate water holding capacity for optimum growth.
Sweet corn grows best in a soil with a pH between 5.8 and 6.5.

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18/02/2019

One summer deep ploughing followed by two or three harrowing with disc or tines and two or three planking should be given to prepare a well-pulverized seedbed.
Use FYM @ 3 -4 t / acre on the last plowing.
After this, lines and ferries should be laid with a difference of 75 cm. Seedbed preparation and seed handling are important for all types of sweet corn.

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