132 Food Plants of Aphis rumicis 



Experiments. Series C. 



This series of experiments consists of observations made on plants 

 grown in the open garden at Acton Lodge. Many different kinds of 

 plants and vegetables were cultivated in various parts of the garden, 

 and weeds were also allowed to flourish in order that observations might 

 be made on the migration of the winged forms of Aphis rumicis from 

 Euonymus. 



On May 24th, three small Euonymus bushes found near Richmond, 

 heavily infested with Aphis rumicis (euonymi), were introduced into 

 the garden at Acton Lodge. There were great numbers of winged forms 

 on these bushes at this time. 



The following notes recorded below will show how the aphids became 

 distributed to many of the plants growing in the garden. The dates 

 given do not denote the exact date when the plants became infected, 

 but the date on which the observations were made. It may be noted, 

 however, that in the case of the Broad Beans, Ajihis rumicis was not 

 found on these plants until the date given below. The infestation 

 of these plants occurring so quickly after the introduction of the infected 

 Euonymus bushes (one bush was placed close to a row of Broad Beans) 

 leaves little doubt that the infection came from Euonymus. By the 

 middle of June, practically all the aphids had left the infected Euonymus 

 bushes. 



Date Host Plant Remarks 



24. 5. 13. Euonymus europaeus. . Three bushes heavily infested with Aphis rumicis, 



introduced into Acton Lodge garden ; many 

 winged viviparous females present. These had all 

 migrated by the 30th May, and by the middle of 

 June the bushes were quite free from aphids. 



Many winged females present and several colonies 

 forming. 



Many colonies now developing on these plants. 



Found several winged viviparous females on some 

 large Euonymus bushes in Acton Lodge garden, 

 and colonies are being produced on these bushes. 



Several plants infected and colonies formmg on them, 

 along the stems and flower-heads. 



Some old Parsnip plants which are running to seed 

 are now infected, and colonies forming in the 

 flower-heads. 



Several plants now infected, one plant near the Broad 

 Beans being especially heavily infected. 



