Vineyard & Orchard Development Specialists
1-209-365-7222 or Call toll free at 1-888-685-1339
Weeds may aggravate pest problems and compete with the trees for nutrients and water. Weeds can also interfere with sprinkler irrigation and, when dry, create fire hazards. Young trees are more sensitive than mature trees to weed competition and
Source: http://pestdata.ncsu.edu/croptimelines/pdf/CAwalnut.pdf
Ground squirrels can cause major damage to the walnut orchard. Ground squirrels are active in the spring, early summer and in the fall, with inactive periods during the summer and winter. Young squirrels may remain active throughout the year. Gr
Source: http://pestdata.ncsu.edu/croptimelines/pdf/CAwalnut.pdf
Walnut blight (caused by Xanthomonas campestris p.v. juglandis) is a bacterial disease that attacks walnuts beginning in early spring, when moisture is available to the bacteria. The northern walnut growing areas tend to have a higher incidence
Source: http://pestdata.ncsu.edu/croptimelines/pdf/CAwalnut.pdf
Codling moth (Cydia pomonella) infests walnuts from mid-April until late September. There are two (cooler coastal districts) to four (hot inland areas) generations of codling moth each year. Early season cultivars are the most affected because t
Source: http://pestdata.ncsu.edu/croptimelines/pdf/CAwalnut.pdf