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Posted 27 August 2012. PMN Crop News.

New Insecticide Proves Effective for Controlling Asian Citrus Psyllid

Source: Marrone Bio Innovations Press Release.

Davis, California (August 15, 2012)--It’s been four years since the Asian citrus psyllid (ACP), a vector for the devastating citrus greening disease huanlonogbing (HLB), was uncovered in California. On March 30, 2012, the California citrus industry was dealt a heavy blow with the inevitable news: The California Department of Food and Agriculture (CDFA) and the U.S. Department of Agriculture reported that HLB was found and confirmed in Los Angeles County.


Confirmation that both Asian citrus psyllid and the HLB disease were found in California has serious implications for the state’s $2 billion annual citrus industry. Fears of devastating declines in revenue and permanent loss of significant amounts of citrus production acreage are well founded. Since the disease first appeared in Florida in 2005, that state has lost billions in revenues, seen more than 6,000 jobs lost and destroyed approximately 200,000 acres of citrus-farmed land.

Grandevo: a new weapon for Asian Citrus Psyllid (ACP) control

Asian citrus psyllids are easy to kill but hard to control. IPM programs must include a combination of cultural controls, insecticide applications and biological strategies in order to keep ACP populations as near to eradication levels as possible, throughout the year.

Unfortunately, maintaining near-zero levels of ACP populations for extended periods using mainly synthetic pesticides is problematic because of concerns over buildup of resistance and the potential disruption of established biocontrol agents of other potentially important pests. However, Grandevo, a new broad-spectrum microbial insecticide from Marrone Bio Innovations, Inc., provides limited disruption of beneficials and promises to be a valuable new weapon for use in the battle to control Asian citrus psyllids.

Grandevo is naturally derived and has numerous compounds that contribute in creating complex modes of action, offering growers and PCAs a new dimension of biological performance and reliable control of chewing and sucking insects and mites—to levels of efficacy comparable to top leading brands. Grandevo is highly active against psyllid adults as well as nymphs, and it also acts as a repellent in treated trees. In addition, Grandevo contributes to reduced psyllid populations by inhibiting reproduction.

Grandevo was first introduced in the Florida citrus market in 2011 to control Asian citrus psyllid, and it is expected to be registered in California this summer. It has proved to be very effective within IPM and IRM programs designed to manage psyllid populations and control other pests for extended periods of time. Grandevo has also been shown to maintain populations of most beneficials and introduced biological controls.

Redefining the role of microbial insecticidesin IPM and IRM programs

Because the use of Grandevo is not constrained by predefined spray windows, efficacy, timing, residue or mode-of-action conflicts, its performance profile suggests strong consideration for use as a foundation or platform product in IPM and IRM programs. Using Grandevo as a platform product allows growers to target or limit the use of synthetic pesticides to application windows where psyllid populations increase (normally just before or during periods of new flush), while satisfying considerations for IPM and IRM requirements. Applying Grandevo alone or in combination/rotation with nonrestricted synthetic pesticides ensures that control of ACP is maintained.