Feb 28, 2014 | View All Issues
The results of the Napa County 2013 VMB Trapping Program are now available as downloadable maps on the Agricultural Commissioner's website.
All vineyard acreage in Napa County was trapped at a density of 25 traps per square mile, to more accurately detect VMB populations in new areas and to track resident populations. This program is supported by funding from the Napa County Wine grape Pest and Disease Control District.
A reminder that we are likely to have another "early" year for VMB. Sampling in Carneros on Jan 8, 2014 revealed mostly 1st instar nymphs (40.6%), but 2nd instar (21.2%) and 3rd instar (14.5%) nymphs were also found, as were females (12.7%) and ovisacs (10.9%).
Careful monitoring of VMB is highly encouraged. Large populations with overlapping generations can be very challenging to control. Multiple, early intervention strategies--targeted insecticides, mating disruption, parasitoid and predator releases--can keep VMB populations low. Rotation of insecticidal materials is also highly encouraged to decrease the potential for resistance to develop and to protect products for future use.
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