Tree Fruit Monitoring Report for Summer 2008
This season we saw a fairly typical pattern of moth flight, with two full generations and a partial third generation in most areas. The cool spring, however, lengthened the first generation flight period by 2 weeks compared to 2007. Another significant difference in flight pattern between 2008 and 2007 occurred during July to mid-August, when one codling moth generation occurred in 2008 and two in 2007.
Our prediction for 2009? Populations (i.e., moth catch per night) should go down. Many farms and homeowners saw a region-wide “off” year for alternate-bearing apple varieties. Growers fortunately maintained control methods on those trees, including mating disruption, preventing those few apples that formed from becoming infested. The lower fruit yield and fewer codling moth generations for 2008 should be good news for apple production in 2009.
Greater Peachtree Borer
This year, we placed three times more pheromone traps than last year in monitoring sites to get a better understanding of the moth flight pattern of this pest. We saw that start of trap catch depended on the site’s population size, where orchards with typically low populations did not see moths until July 8, and highly populated sites saw moths starting June 16. Peak moth flight occurred from late July through mid-August. Sites with heavy populations still had high numbers in mid-September. Flight ended in early October.
In general, most other pests appeared as we typically expect. Because of the cooler summer, spider mite damage was low except in isolated areas. European red mite was nowhere to be seen, and leafrollers were easily controlled as a result of codling moth pesticides. Pear psylla incidence and damage was much lower than in 2007, and fire blight was not as severe as in 2007, although damage was sporadic throughout the apple and pear growing regions. Damage from white apple leafhopper was also minor.