CIRCULAR 600, U. S. DEPT. OF AGRICULTURE 



egg punctures in the controls. The relation of mortality to days under 

 refrigeration is shown graphically in figure 3. 



TESTS AT 32° F. 



The results reported herein corroborate previous findings 7 that com- 

 plete mortality of apple maggot eggs and larvae is effected at 32° F. 



Table 1. — Experimental data on mortality of the apple maggot in fruit held at various 



air temperatures, 1986 



Series and mean recorded air 

 temperature (° F.) 



Days 

 under re- 

 frigera- 

 tion 



Total 

 fruit 



Total egg 

 punc- 

 tures 



Average 

 egg punc- 

 tures per 

 fruit 



Larvae emerging 



Mortal- 

 ity 



Actual 



Theoreti- 

 cal 



Control series: 



65-80 .. 



Number 



{ J 



Number 

 225 

 248 



Number 

 4,034 

 4,474 



Number 

 17.93 

 18.04 



Number 



909 



1,042 



Number 



909 



1,042 



Percent 

 









Total or average .. 





473 



8,508 



17.98 



1,951 



1,951 











32° F. series: 



32.69 



10 

 15 

 20 

 24 

 26 

 28 

 30 

 32 

 132 

 34 

 36 

 38 

 40 

 45 



234 

 244 

 240 

 242 

 234 

 234 

 226 

 236 

 344 

 238 

 237 

 240 

 246 

 227 



4,249 

 4,213 

 5,261 

 4,802 

 4,366 

 3,765 

 3,489 

 4,101 

 6,226 

 4,276 

 4,421 

 3,853 

 4,578 

 4,409 



18.16 

 17.27 

 21.92 

 19,84 

 18.66 

 16.09 

 15.44 

 17.38 

 18.10 

 17.97 

 18. 65 

 16.05 

 18.61 

 19.42 



452 



176 



49 



16 



1 

 2 

 

 

 

 

 

 

 



974 



966 



1,206 



1,101 



1,001 



863 



800 



940 



1,428 



980 



1,013 



883 



1,050 



1.011 



53 6 



32.31 



81.8 



32.32 .. . 



95.9 



32.05 



98 5 



32.17 



99.3 



32.18 



99.9 



32.05 



99.7 



31.99 



100.0 



31.99 . 



100.0 



31.96 ... 



100.0 



31.96 



100.0 



31.94 



100.0 



31.84 



100.0 



31.86 



100.0 







Total or average 





3,422 



62, 009 



18.11 





14, 216 













36° F. series: 



36.21 



10 



15 

 20 

 24 

 28 

 30 

 32 

 34 

 36 

 38 

 40 

 45 

 50 

 60 



244 

 233 

 246 

 231 

 264 

 240 

 242 

 249 

 223 

 251 

 247 

 250 

 120 

 126 



4,253 

 4,394 

 4,989 

 4, 195 

 4,493 

 4,251 

 4,379 

 4,063 

 4,326 

 3,781 

 4,780 

 4,418 

 2,659 

 2,220 



17.43 

 18.86 

 20.28 

 18.16 

 17.02 

 17.71 

 18.09 

 16.32 

 19.40 

 15.06 

 19.35 

 17.67 

 22.16 

 17.62 



689 

 332 

 112 

 55 

 55 

 14 

 8 

 19 

 2 

 



6 





 



975 



1,008 



1,144 



962 



1.030 



975 



1,004 



932 



992 



867 



1,096 



1,013 



610 



509 



29.3 



35.79 



67.1 



36.33 



90.2 



36.35 



94.3 



36.05 



94.7 



36.21 



98.6 



36.21 



99.2 



36.07 



98.0 



36.07 



99.8 



36.12 



100.0 



36.11 



99.9 



36.67 



100.0 



36.47 



100.0 



36.44 



100.0 







Total or average . . 





3,166 



57, 201 



18.22 





13, 117 













40° F. series: 



40.09 



10 

 15 

 20 

 24 

 28 

 30 

 32 

 34 

 38 

 45 

 50 

 60 

 70 



260 

 230 

 271 

 239 

 254 

 250 

 253 

 241 

 207 

 237 

 231 

 222 

 191 



5,026 

 4,392 

 5,569 

 4,568 

 4,748 

 4.022 

 4,626 

 4,108 

 3,978 

 4,717 

 4,777 

 4,321 

 3,338 



19.33 

 19.10 

 20.55 

 19.11 

 18.69 

 16.09 

 18.28 

 17.04 

 19.22 

 19.90 

 20.68 

 19.46 

 17.48 



867 

 625 

 572 

 494 

 400 

 361 

 317 

 233 

 158 

 139 

 88 

 55 

 11 



1,152 



1,007 



1,277 



1,047 



1,089 



922 



1.061 



942 



912 



1,082 



1,095 



991 



765 



24.7 



40.09 



37.9 



40.10 



55.2 



40.08 



52.8 



40.14 



63.3 



40.13 



60.8 



40.12 



70.1 



40.15 



75.3 



40.05 



82.7 



40.35 



87.2 



40.36 



92.0 



40.33 



94.5 



40.34 



98.6 







Total or average 





3,086 



58, 190 



18.84 





13, 342 













Grand total .. ... . 





10, 147 



185, 908 







42. 626 















Grand average .. .. 





236 



4,323 



18.36 





991 













Special lot. all windfalls; many fruits showed emergence holes. 



7 See footnote 2. 



