VELOCITY VALUES (NUMBERS OF DEVELOPftflENTAL 



12.1 

 11,5 

 10.5 



21.4 

 23.2 

 2-1. S 



UNITS PER HOUR), FOR VARIOUS MEAN VALUES OF VARI4R1 c tcmo-to.-,. 



AND EGGS UNDER WEATHER CONimoNs'"'^^''^ ^^° HUMIDITY, APPLICABLE 



TO THE CODLING MOTH PUPAE 



36 I 38 I 40 



23.6 

 25.4 

 26.7 

 27.8 

 29.1 

 30.2 

 31.5 

 32.S 

 34.0 

 36.3 

 36.4 

 37.6 

 37.8 

 37.8 

 37.4 

 36.0 

 35.1 

 33.7 

 32.9 

 32.0 

 30.» 

 29.S 

 28.8 

 27.7 

 26.7 

 25.7 

 24.6 

 23.7 

 22.6 

 21.4 

 20.6 

 19.5 

 18.7 

 17.7 

 16.6 

 15.4 

 14.5 

 13.4 

 12.4 

 11.3 

 10.4 



42 1 44 I 46 I 48 



21.2 

 22.6 

 24.6 

 26.2 



The rate ot developmenL of the codling moth under weather conditions is here expressed in develop- 

 "xWo! units per hour for various mean values of temperature and humidity. (For definitions of develop- 

 loeiital units and other terms, see pp 318 and 331.) These values are for the pupal stage but may be used 

 s'so lor the incubation of the egg, because the rate of development in the egg is affected by temperature and 

 ■iimldity to practically the same extent. For rate of development of the larva, see Table VI. For temper- 

 Mures above 105° F. and humidities below 32 per cent, the rates of development may be read from Fig. 14B, 

 P 388, from which the values shown in this table were obtained. Note that the values read on Fig. 1413 

 ■""St be multiplied by 1.07 to make them true for weather conditions. 



The values in this table represent rates of development for means covering one-hour periods for each com- 

 "Inatlon of temperature and humidity. To bring the average individual through the pupal stage requires a 

 "lirmal total of 6480 developmental units. The normal total for incubation of the egg is 3864 developmental 

 ""Its. For modification of these totals, see Tables III-V. 



These velocity values nmst not be used for mean daily temperatures and humidities. They may, how- 

 ^'er, be multiplied by 2 and thus used tor two-hour periods instead of one-hour periods. 



92 I 94 I 96 I 98 | 100% 



PER CENT HUMIDITY. 



