Aphis pomi Degeer Green apple aphid

The green apple aphid is associated mainly with apple but will also colonize pear, quince and various other trees and shrubs in the family Rosaceae, including ornamentals. Although often common, and causing slight leaf curl, it is usually of importance only on young host plants. The winter is passed in the egg stage on the bark of the young shoots. The eggs hatch from April onwards and ant-attended colonies develop quickly, the aphids clustering tightly together on the underside of leaves and along the new shoots. Winged migrants produced in June spread infestations. Wingless males and females are produced in the autumn prior to the deposition of winter eggs by oviparae. Apterous females (1.3-2.2 mm long) are bright green to yellowish-green with moderately long, black or dark brown siphunculi and a finger-like, tapered cauda (Fig. 191a).

NOTE Several other members of this genus are associated with cultivated plants, including: Aphis craccivora Koch (cowpea aphid), a shiny black aphid

Fig. 191 Siphunculi and caudas of some aphids associated with fruit trees: (a) green apple aphid, Aphis pomi; (b) leaf-curling plum aphid, Brachycaudus helichrysi; (q rosy leaf-curling aphid, Dysaphis devecta; (d) rosy apple aphid, Dysaphis plantaginea; (e) mealy plum aphid, Hyalopterus pruni; (f) apple/grass aphid, Rhopalosiphum insertum.

Fig. 191 Siphunculi and caudas of some aphids associated with fruit trees: (a) green apple aphid, Aphis pomi; (b) leaf-curling plum aphid, Brachycaudus helichrysi; (q rosy leaf-curling aphid, Dysaphis devecta; (d) rosy apple aphid, Dysaphis plantaginea; (e) mealy plum aphid, Hyalopterus pruni; (f) apple/grass aphid, Rhopalosiphum insertum.

infesting herbage legumes and ornamental legumes; A. lambersi (Borner) (permanent carrot aphid), a black to greenish-black aphid on carrot; A. schneideri (Borner) (permanent currant aphid), a dark green, wax-coated aphid on red currant and black currant; and A. triglochinis Theobald (red currant/arrowgrass aphid), a brownish-green species overwintering on red currant and, less frequently, black currant.

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