. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 10 BULLETIN- 640. U. S. DEPARTMENT OF AGRICULTURE. favorable to fruit-fly increase. At Honolulu the temperature rarely drops as low as 58° F., and then only for a few hours during one or two nights in the year. The daily range in temperature is small, averaging between 8 and 11 degrees, while the normal monthly mean temperatures range between ° F. in the winter and 79° F. in the summer. Biological work has shown that even the lowest monthly means of localities up to 1,500 feet elevation have lit- tle effect upon th
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 10 BULLETIN- 640. U. S. DEPARTMENT OF AGRICULTURE. favorable to fruit-fly increase. At Honolulu the temperature rarely drops as low as 58° F., and then only for a few hours during one or two nights in the year. The daily range in temperature is small, averaging between 8 and 11 degrees, while the normal monthly mean temperatures range between ° F. in the winter and 79° F. in the summer. Biological work has shown that even the lowest monthly means of localities up to 1,500 feet elevation have lit- tle effect upon the fruit fly other than to retard somewhat its develop- ment. It is never cold enough throughout the coastal regions of Ha- waii to render either the adults or the larvse inactive. There are no periods of the year at any Hawaiian port when climatic condi- tions are unfavorable for fruit-fly increase. A continuous temper- ature of 58° to 62° F., or the lowest range of temperature usually experienced, does not increase the normal mortality among the larvae. LENGTH OF TIME REQUIRED FOR DEVELOPMENT. During the warmest Fig. 10.—Three important edible fruits subject to fruit-fly attack: -rr „ • • _ wpntVipr a, Strawberry guava: b, loquat: c, star apple. These are grown also xld"dUcU1 eatiiei, for their ornamental value. (Original.) when the mean tem- perature averages about ° F., the Mediterranean fruit fly requires as few as 17 or as many as 33 days to pass through its immature Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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