Selection and pre-treatment of suckers
Select sword suckers of 1.5 to 2.0 kg weight, free from diseases and nematodes. Trim the roots and decayed portion of the corm, cut the pseudostem leaving 20 cm from the corm and grade the suckers to size. To avoid wilt disease, infected portions of the corm may be pared, dipped for 5 minutes in carbendazim 0.1% solution (1 g in 1 l of water) solution for Rasthali, Monthan, Neyvannan, Virupakshi and other wilt
Pralinage with 40 g of carbofuran 3 CG granules per sucker (dip the corm in slurry solution of 4 parts clay plus 5 parts water and sprinkle carbofuran to control nematodes).
Sow sunnhemp on 45th day; incorporate it after about a month. This operation reduces nematode build up.
1) Sigatoka leaf spot
Remove affected leaves and burn
Spray carbendazim @ 1 g/l or benomyl @ 1 g/l or mancozeb @ 2 g/l or copper oxychloride @ 2.5 g/l or ziram @ 2 ml/l or chlorothalonil @ 2 g/l at monthly interval from November onwards
Alternatively spray propiconazole @ 1 ml/l or 0.5 ml/l along with petroleum based mineral oil @ 10 ml/l or Pseudomonas fluorescens @ 0.5% three times at 15 days interval to control sigatoka leaf spot incidence. Always add 5 ml of wetting agent like Sandovit, Triton AE, Teepol etc. per 10 l of spray fluid.
2) Panama Disease (Fusarium wilt)
Uproot and destroy severely affected plants
Apply lime at 1 – 2 kg in the pits after removal of the affected plants
Corm injection: Remove a small portion of soil to expose the upper portion of the corm. Make an oblique hole at 45° angle to a depth of 10 cm. Immediately insert a gelatin capsule containing 60 mg of carbendazim or of 50 mg of Pseudomonas fluorescens or inject 3 ml of 2 % carbendazim solution into the hole with the help of ‘corm injector‘ on 2nd, 4th and 6th months after planting
Apply press mud at 5 kg per plant to reduce the wilt incidence or apply Pseudomonas fluorescens (Pf1) liquid formulation @ 4 l/ha at 2nd, 4th and 6th months after planting through drip system to manage panama wilt and nematode complex.
3) Cigar end rot
CIB recommendation: Spray mancozeb 75% WP @1.5-2.0 kg/ha.
Use virus-free suckers for planting
The banana aphid, Pentalonia nigronervosa is the vector of bunchy-top virus disease
Destroy virus affected plants by inserting a gelatin capsule containing 200 mg 2,4 – D into the corm 7 cm deep using capsule applicator or inject 5 ml 2,4 – D solution (125 gm/lit of water) into the pseudostem by using the injection gun. The plant collapses and topples in 3 – 5 days
Apply carbofuran 3G @ 166 g /plant or spray dimethoate 30EC @ 1 ml/l or methyl demeton 25 EC @ 2 ml/l to control vector
The spray may be directed towards crown and pseudostem base upto ground level at 21 days interval at least thrice.
Kottaivazhai in Poovan:
Spray 2,4 – D @ 25 ppm within 20 days after opening of last hand (1g/ 40 lit / 200 bunches) or 1.2 g of sodium salt of 2,4 – D dissolved in 40 lit of water for 200 bunches.