Effectiveness of Certain Nematicides for Control ofMacroposthonia xenoplaxand Short Life of Peach Trees

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Abstract
Dibromochloropropane was very effective as a preplant and postplant nematocide for M. xenoplax control in a peach orchard where short life became severe 1 yr after planting. Prevention of tree loss and stimulated growth accompanied nematode control. Oxamyl as a foliar spray partially suppressed nematode populations and improved tree vigor in 3-yr old trees, but it apparently reduced growth of trees in their 1st yr and did not improve tree survival. As postplant treatments, ethylene dibromide, 1,3-dichloropropene and fenamiphos temporarily suppressed M. xenoplax; however, the effect did not persist and the treatments did not prevent tree death. Evidence of weakness during fall months was an indication of susceptibility to peach tree short life.