Bioecology and control of Corynespora cassiicola (Berk. & M. A. Curtis) in the cultivation of the tomato (Solanum lycopersicum L.)
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Abstract
In agriculture plant pathogens cause big losses in production. The present work aimed at evaluating aspects bioecological and of handling of Corynespora cassiicola (Berk. & M.A. Curtis), causation of the target spot. For characterization bioecological considered him the effect of different means of cultivations, temperatures and pH on the growth mycelial and sporulation. Determined him Trichoderma's antagonistic effect viride (T4), Trichoderma harzianum (T20) and the percentage of inhibition of the radial growth; and of four protective fungicides (mancozeb, chlorothalonil, zineb and copperoxy chloride) on him pathogenic. The evaluations of the behavior varietal came true in nine genotypes of tomato (Reny, DS 13-4- 2, DS 1, DS 13-3-2-2, DS 13-4, Delia, Pascual, Mali and Medina); where DS 13-4 showed levels of resistance with values of incidence and distribution of 2 and 8 %; on the contrary, Reny, Delia and Pascual turned out to be the most affected; furthermore, the proofs of pathogenicity proved to be positive for Solanum lycopersicum (L). The results proved that colonys grow and sporulatein the evaluated media, most of all in PDA, to intervals from 25 to 30 °C and pH between 5,5 - 7,5. Antagonistic effect proved that there is of T. harzianum (T20) and T. viride (T4) on C. cassiicola, once the stock was considered T20 more effective because mycelial to the 100 % in 72 hours managed to inhibit the growth. Of the evaluated fungicides chlorothalonil to dose of 1,25 kg ia/ha is it was the one that he had bigger effect in inhibiting the growth mycelial and sporulation in vitro of C. cassiicola.
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References
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