Malathion Use on Citrus in California
Date: June 16, 2006
To: Tom Moriarty
CC: Rick Melnicoe
From: Beth Grafton-Cardwell
Kearney Agricultural Center
Subject: RE: malathion use on citrus fruits in CA
1) All citrus
2) Application timing for 7.5 lb would be primarily for scales during
the June-August window. Valencias are harvested during this period
and those growers would like avoid using malathion until after harvest.
Other varieties would be harvesting much later in the season (Oct-following
April). Multiple applications would be extremely rare.
Beth Grafton-Cardwell
IPM Specialist and Research Entomologist
Kearney Ag Center
9240 S. Riverbend Ave.
Parlier, CA 93648
office: 559-646-6591
fax: 559-646-6593
From: Thomas Moriarty
Sent: Thursday, June 15, 2006 12:26 PM
To: Grafton-Cardwell, Beth
Subject: malathion use on citrus fruits in CA
Beth
Thank you for the comment you put together on malathion use on citrus in CA. I have just a few questions.
(1) the 7.5 lb ai/A request, is that for all citrus (grapefruit, kumquat,
lemon, lime, oranges, tangerines, and tangelos)?
(2) what is the application timing of this single 7.5 lb application
(time of year and timing with respect to harvest dates)? The proposed
REI that you saw, (5 days) is going to be revised, and likely be smaller
than 5 days. However there is currently a 7 day PHI based upon 6.25 lb
ai/A at 3 applications and 30 day retreatement interval, and I need to
determine if/how a single application will or will not change the current
PHI.
Feel free to call me if you'd like. I can be reached at 703.305.5035.
Thanks for your help,
Tom Moriarty
OPP
