Control of downy mildew (Peronospora parasitica) of cauliflower (Brassica oleracea var. botrytis subvar. cauliflora) in nursery
2004
A:PS
Details
Title
Control of downy mildew (Peronospora parasitica) of cauliflower (Brassica oleracea var. botrytis subvar. cauliflora) in nursery
Publication Date
2004
Call Number
A:PS
Summary
The efficacy of mancozeb and metalaxyl against downy mildew (P. parasitica) in cauliflower (cv. Snowball 16) was evaluated in Ganeshkhind, Pune, Maharashtra, India, during the winter seasons of 1995, 1996, 1997 and 1998. Metalaxyl 35 SD (Apron) was used as a seed dressing at 2, 4 or 6 g/kg of seeds, whereas metalaxyl MZ 72 (Ridomil) and mancozeb, each at 0.25%, were applied as sprays at 16 days after sowing (DAS). Metalaxyl 35 SD at 6.0 g/kg of seeds + metalaxyl MZ 72 and metalaxyl 35 SD at 4.0 g/kg of seeds + metalaxyl MZ 72 were the most effective against the disease (97.9 and 94.3% reduction, respectively). Metalaxyl 35 SD at 2.0 g/kg of seeds + metalaxyl MZ 72 also markedly reduced the disease incidence (90.7%). Spraying of mancozeb after seed treatment with metalaxyl 35 SD did not have additional advantage over seed treatment with metalaxyl 35 SD at 6.0 g/kg of seeds. Metalaxyl 35 SD at 6.0, 4.0 and 2.0 g/kg of seeds combined with metalaxyl MZ 72 gave complete protection of seedlings up to 27.5, 27.3 and 26.3 DAS, respectively. Metalaxyl 35 SD at 6.0, 4.0 and 2.0 g/kg of seeds protected the seedlings from the disease up to 22.0, 20.0 and 18.0 DAS, respectively. The greatest seedling height (18.7 and 17.6 cm), leaf length (6.0 and 5.8 cm) and breadth (3.2 and 3.1 cm), and fresh seedling weight (6.5 and 6.0 g) were recorded for metalaxyl 35 SD at 6.0 and 4.0 g/kg of seeds + metalaxyl MZ 72.
Journal Citation
v.74(4):230-232, INDIAN JOURNAL OF AGRICULTURAL SCIENCES
Contact Information
harvest@worldveg.org
Record Appears in
Research > Published Articles