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358

BACTERIAL SCAB OF PEPPER: EFFECT OF RELATIVEHUMIDITY.

S. Diab, Y. Bashan, Y. Okon, Y. Heñís*

Differences in relativa humidity (r.h.) significantly affectedbacterial scab development in pepper piants. High r.h. lorlong periods favored infection. However, this pathogen hadmodest requirements for r.h. When it was exposed to high r.h.(> 85%) for a few hours in one or two days, the pathogenattacked its host. Short periods of unfavorable low r.h. afterestablishment of the pathogen in the tissue temporarily preven-ted disease development but it could continué later on, whenhigh r.h. conditions were provided. Long periods at low r.h.irreversibly damaged the ability of the pathogen to muíatedisease even in high r.h. conditions were provided later on oreven after a massive infection by X. vesicatoria had beenensured.

* Dept. Plant Pathology and Microbiology, Faculty of Agri-culture, The Hebrew Universíty of Jerusalem, P.O.Box 12,Rehovot, Israel.

mn1?1? pviDTi to msraxn Trrwrn mato yyn ir nrnsa •rom»» par noipn nn — vara nnsnn1? izbry miabí .ranonVnan nass nx my»j rrnxa tryan1? ,*a~i to isiro .rrnp»

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