Abstract
The effect ofAlternaria alternata on gas exchange proceses, on total yield and on yield components in cottonGossypium hirsutum cv. Acala SJ-2, was examined under field conditions. Variations in disease severity levels were achieved by using three fungicide treatments (Fentin Acetate). Disease developed more rapidly on the upper canopy layer (>661 cm height) than on lower ones. Infections were not accompanied by leaf shedding. The main effect of the disease was a reduction on bolls' number. A significant increase in seedcotton and lint yield, as compared to the untreated control, was achieved by applying fungicides. It was found that omitting early and late applications was not followed by significant yield reduction. Alternaria leaf spot reduced photosynthetic rate more and transpiration rate less, than could be explained by the extent of infected leaf area alone.
Samenvatting
Het effect vanAlternaria alternata op fotosynthese en transpiratie, opbrengstcomponenten en totale opbrengst bij katoen (Gossypium hirsutum L.) werd onderzocht onder veldomstandigheden. Verschillen in aantastingsniveaus werden verkregen door fungicide (fentin acetaat) behandelingen. De ziekte ontwikkelde zich het snelst boven in het gewas (> 60 cm). Infectie ging niet gepaard met bladval. Het belangrijkste effect van de ziekte vormde een afname van het aantal vruchtdozen (‘bolls’). Een significante toename van zaadkatoen (‘seedcottton’) en van vezels (‘lint’) ten opzichte van de onbehandelde controle werd verkregen door toediening van fungiciden. Achterwege laten van vroege en late bestrijdingen had geen significante opbrenstverlaging tot gevolg.A. alternata verlaagde de fotosynthesesnelheid meer en de transpiratiesnelheid minder dan verklaard kon worden uit de geïnfecteerde oppervlakte van het blad.
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Ephrath, J.E., Shteinberg, D., Drieshpoun, J. et al. Alternaria alternata in cotton (Gossypium hirsutum) cv. Acala: Effects on gas exchange, yield components and yield accumulation. Netherlands Journal of Plant Pathology 95, 157–166 (1989). https://doi.org/10.1007/BF01999971
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DOI: https://doi.org/10.1007/BF01999971