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Effect of humidity on epidemiological patterns of the powdery mildew (sphaerotheca fuliginea) on squash

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Epidemics ofSphaerotheca fuliginea on squash in growth chambers developed somewhat better under dry than under humid conditions. The reason appeared to be the differing effects of humidity on the various stages of disease development: dryness favored processes of colonization, sporulation and dispersal, while high humidity favored infection and conidial survival. However, all these processes will occur under conditions of humidity far from their respective optima, thus enabling the development ofS. fuliginea under widely dissimilar conditions. Information is presented on the effects of temperature on colonization and sporulation.

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Correspondence to R. Reuveni or J. Rotem.

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Reuveni, R., Rotem, J. Effect of humidity on epidemiological patterns of the powdery mildew (sphaerotheca fuliginea) on squash. Phytoparasitica 2, 25–33 (1974).

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Key Words

  • Ecology
  • epidemiology