Journal article

Publication year: 1994

Pages: 357-367

Journal: Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz = Journal of plant diseases and protection

Volume number: 101

Issue number: 4

ISSN: 0340-8159

Publisher: Ulmer

Abstract: 
Plutella xylostella (Diamondback moth, DBM) is being diseased on all brassicas grown in Northern Luzon, Philippines, by Pandora blunckii and/or Zoophthora radicans with a disease incidence (DI) ranging from 1 to 97 % (larvae) and 0 to 95 % (pupae). The incidence mainly depends on the density of these stages (R(2) = 0.87 and 0.92) and on the initial inoculum available in the fields. DI is always higher during drier periods, i.e., when brassicas are mainly grown, than in periods with rainfall. The disease progress curves correspond to the general concept: of prey-predator relationships with a time-lag of about 2 weeks, reaching peaks when the population densities of the DBM begin to decline. Some of the curves are bimodal. The infection rates r range from 0.07 to 0.77 per unit/day and the doubling time from 1.2 to 10.2 days. Some aspects in relation to the use of this information for the control of DBM are discussed.

Harvard Citation style: RIETHMACHER, G. and KRANZ, J. (1994) DEVELOPMENT OF DISEASE INCIDENCE OF ENTOMOPHTHORACEAE IN-FIELD POPULATIONS OF PLUTELLA-XYLOSTELLA IN THE PHILIPPINES, Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz = Journal of plant diseases and protection, 101(4), pp. 357-367

APA Citation style: RIETHMACHER, G., & KRANZ, J. (1994). DEVELOPMENT OF DISEASE INCIDENCE OF ENTOMOPHTHORACEAE IN-FIELD POPULATIONS OF PLUTELLA-XYLOSTELLA IN THE PHILIPPINES. Zeitschrift für Pflanzenkrankheiten und Pflanzenschutz = Journal of plant diseases and protection. 101(4), 357-367.