. Bulletin of the Department of Agriculture. Agriculture. 68 BULLETIN 536, U. S. DEPARTMENT OF AGRICULTURE. on work with over 20,000 adults. During the period May 21 to 28, 1913, when the daily temperatures ranged between 69° and 82° F., with a mean temperature for the period of 76° F., and with a mean relative humidity about 66 per cent, many females were not observed mating until 7 to 9 days. During the period December 14 to 24, 1914, when the weather was unusually cool for Honolulu, with the daily temperatures ranging between 61° and 78° F. (a mean for the period about ° F.), and t
. Bulletin of the Department of Agriculture. Agriculture. 68 BULLETIN 536, U. S. DEPARTMENT OF AGRICULTURE. on work with over 20,000 adults. During the period May 21 to 28, 1913, when the daily temperatures ranged between 69° and 82° F., with a mean temperature for the period of 76° F., and with a mean relative humidity about 66 per cent, many females were not observed mating until 7 to 9 days. During the period December 14 to 24, 1914, when the weather was unusually cool for Honolulu, with the daily temperatures ranging between 61° and 78° F. (a mean for the period about ° F.), and the mean relative humidity about 72 per cent, 1 male was ob- served giving the usual evidences of sexual maturity 8 days after emergence, and several others after 9 days. The first eggs, 3 in number, from about 150 females were ob- tained 8 days after emergence, while 10 and 38 eggs, respec- tively, were se- cured after 9 and 10 days. Adults emerging on Jan- uary 3, 1916, did not contain well- developed eggs until 10 days later, as shown by daily dissections. The temperature during this period ranged between 60° and 75° F., with a mean of ° F. The general process of egg formation as it takes place in the egg tubes is shown in figures 15 and 16, representing the development of the eggs 1, 3, 8, and 10 days after emergence. PORTIONS OF PLANT SELECTED. Fig. 15.—Egg tubes of female Mediterranean fruit fly: a, At time of emergence; b, 3-5 days after emergence; during January, 1916. (Original.). Fig. 16.—Egg tubes of female Medi- terranean fruit fly: a, Development after 10 days; 6, after 8 days; during January, 1916, at Honolulu. (Origi- nal.) Adults of the Mediterranean fruit fly oviposit only in the fruit of the host. The female appears to have no preference for any particular area in the epidermis of very soft fruits, such as the strawberry guava, mock orange, coffee, peach, sapota, or eugenia, as egg punc- tures are to be found on all portions of the fruit. But e
Size: 1076px × 2322px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
