Table 1. — Population trends when native population of 1,000 wales and 1 ,000 females is overflooded in each 

 generation by 100,000, 50,000, 25,000, or 12,500 "partially or completely sterile males — Continued 



- 



Males 

 released 



- Til- 

 it y 



Rate of 

 increase 



Progeny in each generation 



F, 



F 2 



F 3 



F 4 



F 6 





X umber 



Percent 





Number 



X umber 



N a mber 



Number 



Number 



48. . . . 



50,000 



MS 



do 



1 . .569 



1,102 



676 



360 



169 





50,000 



99 



do 



1,176 



506 



152 



35 



7 



50 



50,000 



100 



do 



784 



122 



3 











51. 



_ 000 



90 



do 



5 . 385 



20,192 



144,942 



2,229,679 



43,713,314 



52 



. 000 





do 



3,462 



7 , 720 



27,338 



210,949 



3,451,016 



53 



000 



•s 



do 



2,308 



2,919 



4,322 



8,470 



27,435 



54 



25,000 



99 



do 



1,923 



1,795 



1,591 



1,289 



899 





25,000 



100 



do 



1,538 



918 



331 



44 



1 



56 



12,500 



90 



do 



6,667 



38,596 



498,826 



9,548,004 



190,511,260 



57 



12.. 500 





do 



4,815 



19,588 



183,090 



3,243,874 



64,406,113 



58 



12.500 



98 



do 



3,704 



10,848 



68,683 



1,014,428 



19,810,336 



: 



12,500 



99 



do 



3.333 



8,431 



13,789 



560,673 



10,739,599 



60 



12,. 500 



100 



do 



2,963 



6,279 



25,210 



253 , 155 



4,608,045 



til 



100,000 



90 



Fortyfold... 



8,713 



17. 'Ur, 



525,549 



15,806,680 



625,157,160 



- 



100,000 



95 



do 



1 . 7.52 



13,697 



60,753 



659,386 



20,544,136 





100,000 



98 



do 



2,376 



2,90.5 



4,128 



6,574 



13,460 



64 



100,000 



99 



do 



1,584 



1 . 127 



701 



377 



179 



• 



100,000 



100 



do 



792 



12.5 



3 











66. 



000 



90 



do 



9,412 



66,793 



1.230,089 



45,874,200 



1,831,375,800 





000 



95 



do 



5 . 190 



21,838 



192,420 



.5,196,311 



204,124,180 



68 



000 



98 



do 



3,137 



6,2.51 



19,415 



139,272 



3,289,192 



69. 



000 



99 



do 



2,353 



3,083 



4,885 



10,964 



47,283 



" 



50,000 



100 



do 



1 . 569 



969 



372 



55 



1 



71 



- .000 



90 



do 



10,769 



111,782 



3,227,580 



127,330,660 



5,091,427,200 



72 



000 



95 



do 



6,923 



15.842 



924,895 



3.5,193,230 



1,405,831,900 



73 



25,000 



98 



do 



4,01.5 



18,982 



219,932 



7,200,348 



286,067,430 



74 



000 



99 



do 



3,846 



12,418 



102,795 



2,779,722 



109,243,840 





- 000 



100 



do 



3.077 



7,135 



3.5,640 



593,270 



21,886,250 



" 



12..5(H) 



90 



do 



13.333 



220,290 



8,003,322 



319,235,700 



12,768,528,000 



77 



12.500 



95 



do 



9,630 



121,014 



4,053,218 



161,184,550 



6,446,432,000 



78 



12 



98 



do 



7,407 



72,296 



2,163,660 



85,577,594 



3,422,124,000 



- 



1 2 . 500 



99 



do 



667 



58,246 



1,637,138 



64,510,391 



2,579,426,000 



80. 



12,500 



100 



do 



5,926 



1.5,420 



1,171,822 



45,893,778 



1,834,751,700 



sterile, fully competitive insects to each genera- 

 tion would yield 92 F r , progeny. Similarly with 

 a tenfold rate of increase, the release of 100,000 

 98-percent sterile insects to each generation 

 with 100-, 50-, 25-, or 12.5-percent competitive- 

 ness would yield 1, 2, 7, or 471 F 3 progeny, 

 respectively. Thus 98-percent sterile males with 

 25-percent competitiveness would probably 

 cause complete population suppression, whereas 

 95-percent sterility with full competitiveness 



might not. However, if the rate of increase 

 between generations is only fivefold, the release 

 of 100,000 95-percent sterile, fully competitive 

 males would yield two F s progeny. In this case 

 the high level of sterility would not be required. 

 Table 2 illustrates the bonus effect of employ- 

 ing a release strain with a dominant conditional 

 lethal trait. In cases 2, 3, 12, and 20, sub- 

 stantial suppression of a population with four 

 or five generations per year is achieved, 



