Blog posts by pests and pesticides

Written by Zea Sonnabend on Wednesday, February 26, 2014 on pests and pesticides

2014 is the last season in which organic apple and pear growers can use antibiotics to control fire blight. Now is the time to look at non-antibiotic controls, for which there has been significant progress in the past few years. New resources are available to help organic producers make a plan for combatting fire blight. Download the Alternative Controls for Fire Blight 2014 Update. Some additional promising materials are being researched and will become available in the next few years; meanwhile, growers need to start learning to work with the products and techniques available now in order...
Written by Zea Sonnabend on Monday, October 7, 2013 on grower, pests and pesticides

Update October 7, 2013: In September, new Asian Citrus Psyllid (ACP) were found in Dinuba, Exeter, and Wasco, California. This expands the quarantine areas to parts of Kern and Fresno, as well as Tulare County. A quarantine area of 86 square-miles was set up for the find in Exeter on October 2, and similar zones previously in the other new areas. The details and maps can be found at www.cdfa.ca.gov/plant/go/acp-quarantine-sjv. In order to move bulk citrus out of any quarantine area there must be a special permit obtained from CDFA. This involves an ACP-Free Declaration form and the use of...
Written by Zea Sonnabend on Friday, July 19, 2013 on pests and pesticides

The Virginia creeper leafhopper (VCLH), known scientifically as Erythroneura ziczac, has been found in vineyards from the Oregon border to the northern Sacramento Valley, but as of March 2013, it has not made its way to the vineyards of Napa or Sonoma counties. However, VCLH has been found in neighboring Lake and Mendocino counties, primarily in backyard and organic vineyards (1). This newcomer is already common in Ohio, the rest of the Midwest, and some of the east. It is more damaging than the western grape leafhopper. If left untreated, VCLH may cause complete defoliation. For information...
Written by Brise Tencer on Wednesday, January 16, 2013 on grower, inputs, materials, pests and pesticides, regulatory, SOP

Understandably, organic growers are concerned about the Asian Citrus Psyllid (ACP), a pest that is a carrier of a devastating disease of citrus trees, huanglongbing (HLB). ACP findings are particularly concerning for organic producers because of how few choices there are for organic control methods. In cases of CDFA eradication efforts, there are no currently accepted organic treatments, but organic producers do have tools for management and prevention.  We encourage citrus growers to read up on the issue and be proactive with preventive management. In general, organic common sense...