SUMMARY Effects of an alfalfa cover crop on biological control of pear psylla and tree nutrition was assessed. The bullet points below summarize findings. Experimental Orchard (Moxee) • substantial increase in predator densities on orchard floor associated with alfalfa cover crop • no correlative effect on predator numbers in trees • no effects of cover […]
Organic pear growers must balance the conflicting pressures between nitrogen levels and densities of pear psylla, a nitrogen-loving pest of pears. We are assessing in 3 certified organic orchards and 1 experimental orchard whether planting of alfalfa leads to improved tree nutrition and biological control of psylla. Alfalfa was planted in 2 ft wide strips […]