. Annals of applied biology. Biology, Economic; Biochemistry. J. Davidson 53 Three plants of each, kind mentioned above were infected each with one a. v.^ ?, 4th v. gen. from its respective stock plant. After 14 days reproduction, all the aphids produced on each plant were counted. Below is shown the progress of the infestation on these stock plants and Table I gives the number of aphids produced. The column " winged forms" in all the tables refers only to adults or advanced nymphs re- cognisable as immature winged OS c^ f^ Date Text-fig. 1. Max. and min. daily temp, of glass
. Annals of applied biology. Biology, Economic; Biochemistry. J. Davidson 53 Three plants of each, kind mentioned above were infected each with one a. v.^ ?, 4th v. gen. from its respective stock plant. After 14 days reproduction, all the aphids produced on each plant were counted. Below is shown the progress of the infestation on these stock plants and Table I gives the number of aphids produced. The column " winged forms" in all the tables refers only to adults or advanced nymphs re- cognisable as immature winged OS c^ f^ Date Text-fig. 1. Max. and min. daily temp, of glass house between June 25th and August 4th, 1920. Broad beans. A. 22. 5. 14. Infected with 9 w. v. ??. 7. 6. 14. 4th v. gen. are all a. V. ??; large size. 18. 6. 14. Many w. v. $? present; plant heavily infested. Horse beans. A. 22. 5. 14. Infected with 3 w. v. ??. 7. 6. 14. 4th v. gen. are aU a. V. $?. 18. 6. 14. Many w. v. $$ present; plant heavily infested. Papaver rhoeas. A. 22. 5. 14. Infected with 12 w. v. ??. 9. 6. 14. Reproduction slower than on beans; only a. v. ?? produced. 18. G. 14. Moderate infestation, several w. v. ?$ present. 6. 7. 14. Plants sickly; aphids small size. Peas. A. 22. 5. 14. Infected with 3 w. v. $?. 9. 6. 14. 4th v. gen. few in numbers bjit fairly large size, all a. v. $$. 29. G. 14. Aphids moderate numbers, several w. V. ?$ present. 31. 7. 14. Aphids in moderate numbers, many a. v. $?, small size. Euonymus europaeus. A. 24. 5. 14. Infected with 4 w. v. $$. 10. 6. 14. 4th v. gen. small numbers but fairly large size, all a. v. ?$. ^ a. V. = apterous viviparous; w. v. = winged 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 Association of Applied Biologists; Association of Economic Biologists. [Wellesbourne, Warwick, etc. ] Association of Applied Biologists [etc. ]
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