Document ID: EPA-HQ-OPP-2006-0657-0034
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2006-10-11T04:00Z

Date:

 

Thursday, September 14, 2006 01:51PM

Subject:

 

Re: More fill-in the blank -- DNA screening - field sampling for
analysis and ha conversation rates for sterile releases

From:

 

  HYPERLINK "javascript:noop()" \o "Create new mail memo with this
address"  Bruce Tabashnik <brucet@Ag.arizona.edu>  

To:

 

cc:

 

  HYPERLINK "javascript:noop()" \o "Create new mail memo with this
address"  LAntilla@AZCotton.org ,   HYPERLINK "javascript:noop()" \o
"Create new mail memo with this address"  Bob Staten <azbugdoc@cox.net>
,   HYPERLINK "javascript:noop()" \o "Create new mail memo with this
address"  tdennehy@Ag.arizona.edu 

bcc:

 

Sharlene, 

To convert to ha multiply acres X 2.47 because there are 2.47 acres per
ha. 

So 20 steriles/Bt acre = 49.4 steriles per Bt ha. 

100 steriles per non-Bt acre = 247 steriles per non-Bt ha. 

It's best to keep "per day" separate from "per release." 

The latest information I have on releases is the following, based on a
conversation with Bob Staten (8-25-06): 

Non-Bt cotton, 3 releases per week (1 release per 2.3 days) 

Mean to date = 251 moths per acre per release (621 per ha per release) 

251 moths per acre per release X 3 releases per week = 753 moths per
acre per week 

753 moths per acre per week divided by 7 days per week = 108 moths per
acre per day 

Bt cotton, 3 releases per week (1 release per 3 days) 

Mean to date = 53.1 moths per acre per release (131 per ha per release) 

53.1 moths per acre per release X 3 releases per week = 159.3 moths per
acre per week 

159.3 moths per acre per week divided by 7 days per week = 22.8 moths
per acre per day 

If non-Bt = 7% of acreage, Bt =  93% of acreage, 108 X 0.07 + 22.8 X
0.93 = 7.56 + 21.2 = 

actual mean release rate = 28.8 moths per acre (71.1 per ha) per day 

Note:  Production of 70 million moths per week /165,000 acres of cotton
= 420 moths per acre per week = potential mean release rate = 60 moths
per acre per day (estimated mean is half of this) 

Should have more info for you later today on PCR sampling, I don't have
"suspect site" info. 

Bruce