J. Davidson 131 



Several small colonies present beneath the leaves of the Rumex sanguineus 

 plants. There is a great deal of Rumex present so that the colonies 

 are widely distributed. 



There are no colonies forming on the Swedes. 

 10. 10. 1.3. The Broad Beans, Poppies, and Nasturtiums have aH died down. Beet, 

 Mangolds and Swedes are growing well, and look healthy. Aphids 

 seem to have all disappeared, having died off, and only an isolated 

 individual to be seen here and there. 



Com'partment B. 



3. 6. 13. Euonymus bush infected with Aphis rumicis from Euonymus B placed 



in this compartment. 

 3. 7. ] 3. Winged viviparous females have been produced on the infected Euonymus 



bush, and several winged forms have migrated to the Broad Beans 



where they are forming colonies. 

 14. 7. 13. Broad Beans now faii'ly heavily infested, and a few small colonies are 



also going on the Poppies. 

 22. 7. 13. The Broad Beans are heavily infested. Colonies forming rapidly on the 



Shirley Poppies. The aphids have all left the Euonymus bush. 

 10. 8. 13. The Broad Beans and Shirley Poppies are now heavily infested. Papaver 



rhoea plants also attacked, and many of the leaves are curled and 



clustered together owing to the aphids. The Shirley Poppies are 



especially infested along the flower-stalks. 

 10. 10. 13. The Poppies and Beans have now died down. The aphids seem to have 



all disappeared, having died off. An isolated winged form here 



and there on the dead plants. No aphids on the Euonymus bush, 



which is growing fast. 



Compartment C. 



3. 6. 13. Euonymus bush infected with Aphis rumicis from Euonymus B, placed 



in this compartment. 



The colony is very small, and does not seem to be making any progress. 



3. 7. 13. One small colony on the Rumex plants. The aphids on the Euonymus 



bush are small in size and numbers, and do not appear to be going 



well. 



14. 7. 13. No aphids on the Broad Beans. The aphids present on the Euonymus 



bush are not making any progress. 

 10. 8. 13. No aphids on the Euonymus bush. A few winged viviparous females 

 present on the Broad Beans, but only a few small colonies formed. 

 10. 10. 13. The Broad Beans have died down. 



