Leaf spot of sunflower
“The disease is a destructive one, widely distributed wherever the crop is grown.
Severe reduction in seed and oil yield reported.
The most affected components are number of seeds per head and the seed yield per plant.
The disease also affects the quality of sunflower seeds by affecting germination and initial vigour of the seedlings.
The disease is characterised by the development of dark brown to black, circular to oval spots varying from 0.2 to 5 in diameter.
The spots are surrounded by necrotic chlorotic zone with grey white necrotic centre marked with concentric rings.
Spots first appear on lower leaves, later spread to middle and upper leaves.
At later stages, spots may be formed on petioles, stem and ray florets.”
Disease causing Species Name:
Alternaria helianthi
Major Plants under threat:
Sunflower
Method of Application:
seed treatment, soil application, foliar spray
Intervals:
Spray on the foliage during evening hours. Apply in wet soil as basal dose along with organic manure and refresh it periodically along with organic manure
Dosage:
“The normal dosage of ABTEC Pseudo is 20g per plant.
Seed treatment: Spray the seeds with a sticky / gummy solution like starch solution or jaggery solution, so that the surface of the seed will be wet. Take ABTEC Pseudo in a tray (@ 25 g/1 kg of seeds), add the wet seeds to this and gently mix by rolling the seeds in the powder so that the seeds will be coated uniformly. Dry the seeds in shade for 30 minutes and sow within a day. For seedlings, dip the seedlings in a slurry of ABTEC Pseudo ( make a
5 – 10% slurry in sticky solution) for 5 – 10 minutes before planting.
Soil Application: ABTEC Pseudo can be used for soil application after mixing with appropriate amount of ABTEC Super Organic Manure or Farm Yard Manure @ 20kg /Ha.
Foliar Spray: Mix 1kg ABTEC Pseudo in 50 litres of water and spray on the foliage”””
