Paramount Farming Company, 33141 E Lerdo Hwy., Bakersfield, CA 93308, USA.
J Econ Entomol. 2011 Feb;104(1):211-9. doi: 10.1603/ec10162.
Egg traps are the primary tool for monitoring egg deposition of the navel orangeworm, Amyelois transitella (Walker) (Lepidoptera: Pyralidae), and for timing treatments for this pest in almonds, Prunus amygdalus Batsch, and pistachios, Pistacia vera L. We compared, in almond and pistachio orchards, the number of eggs per trap in traps baited with almond meal, pistachio meal, or the current standard commercial bait. When considering cumulative eggs captured over an extended period, traps baited with pistachio meal prepared from previous-crop nuts generally captured a similar number of eggs compared with the commercial bait, and more eggs than those baited with almond meal prepared from previous-crop nuts. However, differences in eggs per trap between bait formulations were not as evident when examining individual weeks, particularly in weeks with few eggs per trap, as is typical when treatment decisions are made. The variance in eggs per trap was generally greater than the mean and increased with the mean and, when mean eggs per trap was low, most traps did not have eggs. We discuss implications of these findings for the relative importance of bait type and trap numbers for monitoring, and for experiments comparing egg trap performance.
卵阱是监测脐淡黄卷叶蛾（Amyelois transitella（Walker））（鳞翅目：Pyralidae）卵沉积的主要工具，也是在杏仁和开心果中对这种害虫进行处理的时机。我们比较了杏仁和开心果果园中，用杏仁粉、开心果粉或当前标准商业诱饵诱捕的每个陷阱中的卵数。当考虑在较长时间内捕获的累积卵数时，用前茬坚果制成的开心果粉诱饵诱捕的陷阱通常捕获的卵数与商业诱饵相似，比用前茬坚果制成的杏仁粉诱饵诱捕的陷阱捕获的卵数更多。然而，在检查个别周时，诱饵配方之间的每个陷阱中的卵数差异并不明显，尤其是在每个陷阱中卵数较少的周，这在做出处理决策时很常见。每个陷阱中的卵数的方差通常大于平均值，并且随着平均值的增加而增加，而当每个陷阱中的平均卵数较低时，大多数陷阱中没有卵。我们讨论了这些发现对监测中诱饵类型和陷阱数量的相对重要性的影响，以及对比较卵阱性能的实验的影响。
