Leaf wetness model for Botryosphaeria risk in pistachios and walnuts
Relative risk of infection of pistachio or walnut by Botryosphaeria as affected by wetness period (W) events and Temperature (T)
Notes:
Based on rainfall amount and temperature, use this LWM graph during a rain event to pinpoint the BOT risk zone and determine whether a spray is needed. A spray is applied when points fall in medium and high risk. If a point falls on the line separating low and medium risk, a spray is also applied.
*Leaf wetness period in hours starts as soon as a rain begins to the end of the rain +1/2 hour when is clear or +1 hour when it is overcast after the end of the rain. If rain is off-and-on but with less than 1/2 hour of clear skies or less than 1 hour of cloudy skies between showers, that also counts towards the leaf wetness period. For more precision, use a leaf wetness sensor.
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