A Comparison of Methods Used to Estimate the Maturity and Release of Ascospores of Venturia inaequalis

Plant Disease
D M GadouryA Stensvand

Abstract

Maturation and release of ascospores of Venturia inaequalis were assessed at Geneva and Highland, NY, and at Durham, NH, by microscopic examination of crushed pseudothecia excised from infected apple leaves that were collected weekly from orchards (squash mounts) in 14 siteyear combinations. Airborne ascospore dose was monitored at each location in each year of the study by volumetric spore traps. Additional laboratory assessments were made at Geneva to quantify release from infected leaf segments upon wetting (discharge tests). Finally, ascospore maturity was estimated for each location using a degree-day model developed in an earlier study. Ascospore maturation and release determined by squash mounts and discharge tests lagged significantly behind cumulative ascospore release as measured by volumetric spore traps in the field. The mean date of 98% ascospore discharge as determined by squash mounts or discharge tests occurred from 23 to 28 days after the mean date on which 98% cumulative ascospore release had been detected by volumetric traps. In contrast, cumulative ascospore maturity estimated by the degree-day model was highly correlated (r2 = 0.82) with observed cumulative ascospore release as monitored by the volumetric t...Continue Reading

References

Jan 1, 1989·Drug Metabolism Reviews·P W Albro, S R Lavenhar
Jan 1, 1995·Journal of Thrombosis and Thrombolysis·H D White, S Yusuf
Apr 20, 2004·Environmental Pollution·R C SeemJ M Russo
Aug 1, 1998·Plant Disease·Donald E Aylor

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