Document ID: EPA-HQ-OPP-2006-0657-0038
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2006-10-11T04:00Z

DRAFT 6-23-06

Table 1. Parameter values for eradication model (revised from Sisterson
et al. 2004). 

Default values are indicated by an asterisk.

Page 1 of 2

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Parameter							Values	________________

Adults

Mean % of adults that leave their natal field			10, 55*, 75	

Number of eggs per female per day in Bt cotton fields	10

Number of eggs per female per day in non-Bt cotton fields	10			

Mean % of adults that die each day				10					

Egg-pupae

Mutation rate (from S to R per allele)				5 x 10-5			

Mean % of SS and RS killed in non-Bt cotton fields		79.2				

Mean % of RR killed in non-Bt cotton fields			79.2, 81.3*(10% fitness
cost)

Mean % of SS and RS killed in Bt cotton fields		99.8a, 100*			

Mean % of RR killed in Bt cotton fields			79.2, 83.2*(incomplete R=0.9)	

Development time (degree days)				433				

Mean % of larvae that die during overwintering		95						

Region

Initial R allele frequency					0.0001, 0.001*, 0.01		

Number of fields						400*, 900			

Size of fields							15 hectares		

Percentage of Bt fields						80, 85, 90, 95, 100*

Percentage of Bt plants in Bt fields				99a, 100*

Distribution of fields						Random	

Carrying capacity per field					4,200,000				

Initial overwintering larvae per field				2900, 29,000*, 290,000

a 99.8% mortality of RS and SS simulates 100% Bt fields that have 99% Bt
cotton plants and 1% non-Bt cotton plants (contaminants);  100% die on
the Bt plants, 79.2% die on the non-Bt plants

(0.99 X 100% + 0.01 X 79.2% = 99.8%)

Steriles

Release period							May 1-Oct 15 (1st bloom to defoliation) 

Frequency of releases in each field				1 per 3 days per field

Sex ratio of steriles						1 female: 1 male

Steriles per ha per release in Bt cotton fields			0, 25, 75*, 150 

(=0, 50, 150, 300 per week per ha)

Steriles per ha per release in non-Bt cotton fields		0, 100, 500*, 1000 

								(=0, 200, 1000, 2000 per week per ha)

Pheromone ropes only in non-Bt cotton fields

All non-Bt fields treated once early in season			May 17-June 20 (6-leaf
stage)

Daily % reduction in fecundity caused by pheromone ropes	20, 40*, 60 for
30 days

 

Insecticide & pheromone sprays only in non-Bt cotton fields 

Spray threshold (check sterile male:native male ratio weekly) 	≥60 no
spray

								30-59 spray pheromone

								0-29 spray pheromone + insecticide

Daily reduction in fecundity caused by pheromone sprays 	20, 40*, 60 for
14 days

Mean % of adults killed daily by insecticide			37 per day for 5 days

Mean % of eggs killed daily by insecticide			95 per day for 5 days

Larvae are not killed by sprays