Effect of Chipping and Solarization on Emergence and Boring Activity of a Recently Introduced Ambrosia Beetle (Euwallaceasp., Coleoptera: Curculionidae: Scolytinae) in Southern California

摘要: Polyphagous shot hole borer (Euwallacea sp., Coleoptera: Curculionidae: Scolytinae) has recently invaded southern California. The beetle, along with its associated fungi, Fusarium euwallaceae, Graphium and Acremonium causes branch dieback tree mortality in a large variety of species including avocado (Persea americana Mill.) box elder (Acer negundo L.). With the spread beetle through Los Angeles, Orange, San Diego Counties California, there is increasing concern that felled trees pruned branches infested polyphagous should receive sanitation treatment to reduce potential from movement untreated wood. We tested two methods populations, chipping commercial chipper solarization by covering logs clear or black plastic full sun. Both decreased emergence boring activity compared control logs. Chipping was most effective for chip sizes <5 cm. Solarization using polyethylene sheeting during hot summer months, particularly August, when daily maximum temperatures were ≥35°C. Beetles persisted 2 mo more applied spring fall.