. The culture and diseases of the sweet pea. 156 DISEASES OF THE SWEET PEA. FIG. 32. SHOWING HOW APHIDS FEED AND THE NECESSITY OF A CONTACT SPRAY TO KEEP IT IN CHECK. (COURTESY OF THE KENTUCKY TOBACCO PRODUCTS CO.) do any males occur. This form of repro- duction without the intervention of the male is known as parthenogenesis. On the approach of cool fall weather a generation. 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 work..
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. The culture and diseases of the sweet pea. 156 DISEASES OF THE SWEET PEA. FIG. 32. SHOWING HOW APHIDS FEED AND THE NECESSITY OF A CONTACT SPRAY TO KEEP IT IN CHECK. (COURTESY OF THE KENTUCKY TOBACCO PRODUCTS CO.) do any males occur. This form of repro- duction without the intervention of the male is known as parthenogenesis. On the approach of cool fall weather a generation. 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 work.. Taubenhaus, J. J. (Jacob Joseph), 1885-. New York : E. P. Dutton & Company