Notes: Dynamics of Aeciospore Inoculum Production by Cronartium quercuum f. sp. fusiforme on Slash Pine
Abstract:Aspects of aeciospore inoculum production by Cronartium quercuum f. sp. fusiforme, specifically the dynamics of sporulating galls and gall mortality and the patterns of sequential sporulation, were characterized for two populations of rust galls on slash pine. Population A occurred in a plantation (10 years old, initially) near Gainesville, Fla., and was observed for eight successive years (1973-80). Individual galls were not tagged and population totals reflect both ingress and mortality of galls. Population B occurred in two plantations (10 and 11 years old, initially) in north Florida and one plantation (8 years old initially) in south Georgia and was observed for four successive years (1977-80). Individual galls were tagged, but ingress of new galls was disregarded. The number of sporulating galls decreased from 330 to 35 (89 percent) in population A as the plantation aged from 10 to 17 years. Similarly, sporulating galls decreased from 592 to 104 (82 percent) in population B as the plantations aged from 8, 10, and 11 to 11, 13, and 14 years, respectively. Decreases were primarily due to gall mortality resulting from natural pruning and death of branches with galls. Based on the total number of living galls at the initiation of the study, gall mortality was 71 percent and 64 percent for populations A and B, respectively. Natural pruning and gall mortality resulted in decreased disease incidence and severity and, most importantly, inoculum. In both populations numbers of sporulating galls were directly related to numbers of living galls. All combinations of sequential sporulation patterns were observed. Of the 347 galls alive for 4 years in population B, 11 percent sporulated every year, 51 percent sporulated at least two successive years, 4 percent sporulated every other year, and 18 percent never sporulated. An index of the relative amount of sporulation for 38 galls which sporulated successively for 4 years indicated that inoculum per gall was declining. These results are discussed relative to the fusiform rust epidemic and inoculum management. Forest Sci. 30:787-792.
Document Type: Miscellaneous
Affiliations: Biologist, School of Forest Resources and Conservation, University of Florida, Gainesville, FL 32611
Publication date: September 1, 1984
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