Effect of some non-chemical, seed and foliage applications on cotton damping off disease incidence and yield characteristics [electronic resource].

Includes references.

Four different beneficial microorganisms namely (Trichoderma harzianum, Bacillus subtilis, Pseudomonas fluorescens and mixture of mycorrhizal I fungi. Glomus etunicatum, G. intraradices, G. fasciculatum), were used. as seed treatment to study their effects on cotton seedlings damping off disease incidence in comparison with the effect of recommended dose of fungicide moncirine. These treatments were implemented under greenhouse (artificial heavily infested soil) an4 field (naturally infested soil) conditions. Foliage treatments were only applied under field conditions to study their effects on quality and seed oil content. Foliage field applications included, Trichoderma harzianum and Bacillus subtilis, humic acid, and calcium chloride ~reparation. Data of greenhouse show that soaking cotton seeds for 48 h in T. harzianum and B. subtilis preparations led to best disease control and highest number of survived plants, compare with control treatment. Data also showed that cotton plant protections was positively correlated with concentration of bioagents and length of soaking period. Results obtained from field experiments were in harmony with those obtained from greenhouse I ones regarding damping off percentage, and survived plants. Plant heights were also detem1ined in survived plants after one month in different treatments. Data obtained show that B. subtilis followed T. harzianum if compared with fungicide or control ones. Regarding effect of foliage treatment on fiber quality and seed oil content, obtained data show that different treatments were variedin their effects on different parameters, color,_ fiber length, fiber strength and elongation percentage, fiber fineness and maturity lea product and percentage of seed oil contents. T. hazianum showed the best results on the previously measure parameters. No significant effect on color yellowness was obtained. B. subtilis occupied the second rank after T. harzianum where it improved. lea product and fiber length. Foliage treatment with Ca,Cl2 led to improvement in fiber fineness and maturity, Foliage treatment with humic acid 45 % at 100 mil 20 I. Water show no significant differences in all measured parameters compared with control one.

Summary in Arabic.

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