Pest Archives - Page 2 of 17 - West Coast Nut

-Advertisement-

Pest



An Unsettling Trend


As Mel Machado, Blue Diamond Growers’ vice president of member relations, clicks through the data comparing reject levels from 2021 to previous years, he doesn’t like what he sees in the brown spot column. “What’s got me spooked is not just the total amount of [brown spot] damage, but it’s the trend,” Machado said. “It’s growing as a percentage of damage, and we don’t have a lot of good ways of controlling it. There are no treatment thresholds; it’s just a judgment call. [caption id="attachment_12663" align="aligncenter" width="500"] Signs of stink bug feeding and, to...

Read More

Spotted Lanternfly Risk to California Walnuts


The spotted lanternfly (SLF), Lycorma delicatula, which is an invasive pest in many parts of the Eastern U.S. and is spreading westward, has multiple cultivated and wild hosts in California (Dara and Bocco 2021). The black walnut (Juglans nigra) and other Junglandaceae members are common hosts of SLF (Dara et al. 2015). The cultivated English walnut (Juglans regia) and the endemic California walnut (Juglans californica) are among the important hosts that could harbor SLF populations and are at risk if the pest invades California. The extent of SLF risk to various cultivated hosts, potential economic losses and the distribution of...

Read More

Taking Care of Your Neighborly Nuts: Orchard Sanitation, Pest Control are Neighborly Acts


As tree nut acreage throughout the West increases, chances are that isolated block of trees planted several years ago is now at least partially surrounded by other tree nuts. Those new acres may be planted to the same variety of tree nut or a different variety, but how those new blocks are managed can have an effect on your orchard health and crop quality. “The two biggest concerns with neighboring orchards are navel orangeworm and dust,” said Almond Board of California Chairman of the Board Brian Wahlbrink. “You hope your neighbor will maintain adjacent roads, control dust and keep their...

Read More

Keep the Pressure on Navel Orangeworm with IPM and Mating Disruption


The 2022 growing season will likely continue to present uncertainties around supply chain, availability of critical crop inputs like fertilizers, costs of materials and access to labor, among others. One unfortunate certainty that California nut crop growers have come to expect is the potential for navel orangeworm (NOW) to cause economic damage in almonds, pistachios and walnuts. For the past several decades, NOW has been a primary insect pest in these crops. Despite the perennial threat of NOW, the outlook for this pest is increasingly encouraging. Advances in research and technology, coupled with historically proven practices, have equipped growers and...

Read More

To Treat or Not to Treat: Scale Pests in Walnuts


Depressed walnut prices and higher input costs have put a premium on pest management decisions and increased the importance of dormant monitoring for scale pests in walnuts. UC IPM Pest Management Guidelines advise growers and crop consultants to monitor scaffolds, limbs, branches and prunings in the dormant period for San Jose scale, Italian pear scale and, most prominently, for walnut scale and frosted scale. At high populations, walnut and frosted scales can reduce yields and quality and create issues with other plant pests, particularly Botryosphaeria.   [caption id="attachment_12237" align="aligncenter" width="487"] Dead walnut scale adult...

Read More