Jul 26, 2011 | View All Issues
Most of the summer generation of the GMB has hatched.
At our sampling site in Pope Valley, 69% of the sampled population was in the egg stage on July 11, 2011. By July 21, 2011, only 14% of the sampled population remained in the egg stage. A small percentage of the crawlers had moved out onto the leaves, but most remained under the bark on July 21, 2011.
At our St Helena sampling site, only 2% of the sampled population remained in the egg stage on July 22, 2011. The hatched crawlers were found principally under the bark of the arms and cordon, with a few remaining on the trunk. We also found one GMB 1st instar on the fruit, on a berry of a cluster that was in direct contact with the cordon.
As the summer generation develops, the nymphs will move into the fruit to feed.
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