Phytopathology (1996) 86, p. S86 (Driever et al.)

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G.F. Driever, J.A. Duthie and S.L. von Broembsen (1996)
Fungicide application thresholds for pecan scab derived from epidemiological and weather data
Phytopathology 86 (11 suppl.), S86-S86
Abstract: In 1994 and 1995, increase of pecan scab caused by Cladosporium caryigenum was assessed weekly on leaves and fruit of susceptible cultivars and native pecans in three Oklahoma orchards. Selected weather variables were monitored continuously within each orchard and at Mesonet weather stations within 20 miles of each orchard. Over all orchard-year combinations, increase of scab was best predicted by air temperature (AT) and relative humidity (RH). Fungicide application thresholds of accumulated hours favorable to disease increase (2.1C < AT < 29.4C and RH > 80%) were identified for different levels of susceptibility. A threshold of 200 hours has been selected for testing against full calendar sprays in moderately and highly susceptible cultivars during 1996.


Research topic(s) for pests/diseases/weeds:
thresholds/decision-support systems
population dynamics/ epidemiology

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Venturia effusa Pecan/hickory (Carya) U.S.A. (mid S)
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