The effect of seed treatment with different poisons on seed borne micflora and cotton seedlings

Document Type : Research Paper

Abstract

Abstract
Seed rot, seedling diseases and trips are the most important causes of cotton losses. Seeds of cotton cultivar of Varamin were dressing with fungicides sulfur, Carboxin-Thiram and micronized sulfur and insecticides imidacloprid and thidiocarpwith range of 5 gram of insecticide and fungicide for 1000 gram of seeds alone or both application .Seeds were planted in sterilized sand and irrigated with sterile water.The diseased seedling and decayed seed were removed from soil, washed with sterile water and surface sterilized with 0.5% sodium hypochlorite, and cultured on PDA media amended with antibiotics. Fungal isolates were identified based on morphological features.The results showed that the best fungicides and insecticides for seed disinfection are micronized sulfur, micronized sulfur with imidacloprid, sulfur, sulfur with thidiocarp, Carboxin-Thiram with thidiocarp, Carboxin-Thiram with imidacloprid, sulfur with thidiocarp,and sulfur with imidacloprid respectively. Fungal isolates belonging to Alternaria sp., Aspergillus sp., Basipetospora sp., Bipolaris sp., Cephalosporium sp., Cheatomium sp., Cladosporium sp., Fusarium spp., Geotrichum sp., Melanospora sp., Monascus sp., Myrothecium sp., Mucor sp., Penicillium spp., Rhizoctonia sp., Rhizopus sp.,Sclerotium sp., Ulocladium sp. were isolated with varying frequencies of embryo and seed coat ,decayed seeds and diseased seedlings.
Key words: Cotton, micronized sulfur, thidiocarp, fungicide, insecticide and disinfested.
* Part of the results of the research project No: 2 -41 -07-92101of Agricultural Research, Education and Extension Organization.

Keywords

References

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