PCC_MayJun_2019_e
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“<br />
In southern California a total<br />
of 1,127 HLB positive trees<br />
have been removed. Last<br />
year at this time the number<br />
was 501 trees. This shows the<br />
disease is spreading...<br />
“<br />
ACP tamarixia emergence holes.<br />
Continued from Page 30<br />
the pesticide used is important. Broad<br />
spectrum products that have a four plus<br />
week residual include Baythroid, Danitol,<br />
Actara, Admire, Leverage and Agri-flex.<br />
These products come with a warning<br />
that use may cause flare ups of scale or<br />
mites. Insecticides that are selective with<br />
a two to four week residual are Delegate,<br />
Exirel, Fujimite, Movento and Surround.<br />
Materials allowed in organic production<br />
have a residual of less than two weeks.<br />
They include Pyganic, Entrust, oils and<br />
Celite. These need to make direct contact<br />
to be effective and Grafton-Cardwell<br />
recommends two spray applications to<br />
increase chances of control.<br />
The longer the residual, the more effective<br />
the product will be in controlling ACP<br />
as eggs and nymphs are difficult to reach<br />
with a spray and adult ACP can fly in from<br />
untreated areas and not be affected. The<br />
goal is to keep ACP nymphs below 0.5 per<br />
flush. Admire and Platinum gave the best<br />
results.<br />
Biological Control<br />
Biological control, release of the parasite<br />
Tamarixia by California Department of<br />
Food and Agriculture (CDFA) throughout<br />
ACP infested residential sites in southern<br />
California, will continue, Grafton-Cardwell<br />
said. Releases in commercial citrus are not<br />
feasible due to use of spray applications for<br />
other insect pests and timing.<br />
Tamarixia populations build and move<br />
into citrus October-November, after fall<br />
flush.<br />
Control measures buy time for research<br />
and horticultural advances including<br />
early detection, using genetic engineering<br />
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32 Progressive Crop Consultant May/June <strong>2019</strong>
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