Differences among avocado cultivars in susceptibility to polyphagous shot hole borer (Euwallacea spec.)

作者：Jones Michele Eatough^*; Paine Timothy D

来源：Entomologia Experimentalis et Applicata, 2017, 163(3): 296-304.

DOI：10.1111/eea.12577

• ambrosia beetle
• host preference
• Hass
• Fuerte
• Zutano
• Coleoptera
• Curculionidae
• Scolytinae
• Persea americana
• Lauraceae
• fusarium dieback

Polyphagous shot hole borer (PSHB) (Euwallacea spec.; Coleoptera: Curculionidae: Scolytinae) has recently invaded southern California, USA. Along with its associated fungi, the beetle causes branch dieback and tree mortality in more than 200 host tree species, including avocado (Persea americana Mill., Lauraceae) and many important native, urban landscape, and nursery stock trees. As PSHB spreads into the avocado-growing regions of southern California, there is a pressing need for more information for effective management of the insect/fungus complex. The objective of this study was to examine avocado cultivars to see whether there were differences in susceptibility to attack and gallery development from PSHB. We conducted choice and no-choice trials with cut branches in the laboratory, artificially infested avocado saplings with PSHB, and also surveyed attack rates for two cultivars of field-grown avocado subject to natural attack by PSHB. Laboratory and field trials showed similar patterns for preference among avocado cultivars indicated by beetle attack rates and gallery formation. Among the common commercial cultivars, Fuerte, Gwen, and Bacon most often had lower attack rates and lower rates of gallery formation. Zutano most frequently indicated high attack rates and much gallery formation, indicating that it may be the most susceptible to PHSB of the commercial cultivars.

• 出版日期2017-6