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Temperature and wetness duration requirements for almond anthracnose development on leaves and blossoms

Temperature and wetness duration requirements for almond anthracnose development on leaves and blossoms

Phytopathology 92(6 Suppl.): S19-S20

Anthracnose, caused by Colletotrichum acutatum, is an important disease of almonds in California. Because infections can occur throughout the spring and early summer, a model for disease prediction would improve anthracnose management by more effective fungicide application timings. Microclimate parameters conducive for disease development (temperature, wetness duration - WD) were evaluated in growth chamber inoculation studies on cv. NePlus Ultra, Wood Colony, Carmel, and Nonpareil. For both leaves and blossoms, 10degreeC represented a critical low threshold temperature for disease development. Longer WD was needed for leaves than for blossoms indicating the higher susceptibility of blossoms. At 15degreeC, the positive slope of the regression of disease intensity on WD between 3 and 72 h was significantly greater for leaves than for blossoms. Field data indicated that fruit responded similar to leaf tissue. Among the cultivars evaluated, Nonpareil was least and NePlus Ultra was most susceptible. Our data show that different disease prediction models are required for blossom and leaf/fruit tissues.

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