REPORT OF THE SOCIETY 85 



Green Gooseberry Aphis (Aphis Sanborni Patch) — Green; honoy-tubcs 

 white. 



Grape Phylloxera (Phylloxera vitifoliae Fitch = vastatrix Planchon). — Four 

 forms are recognized : 1. Wingless leaf-gall form ; 2. Wingless root form; 3. Winged 

 form; 4. Sexual form. 



1. Adult leaf-gall form is a wingless female, plump, orange-yellow. Fills 

 gall with many yellow eggs which hatch in 8 days into females. Several genera- 

 tions during summer. The feeding puncture stimulates the growth of the leaf 

 tissue so that a hollow gall is produced, opening on the upper surface. 



2. Root form similar to that on leaf; often dferived from leaf form; several 

 generations in a season; yellowish and wingless, and forms nodules which break 

 down and decay, often destroying the root. Yellowish oval eggs are laid on the 

 roots. La*rvae moult three times. Leaf-galls are most common on American 

 grapes while root-galls are most common on European grapes. 



3. Some of the root forms in late summer develop elongate long-legged 

 winged females that fly to neighboring vines and lay 2-4 eggs beneath loose bark. 



4. These eggs are of two sizes — the smaller producing males, the larger 

 sexual females. These are wingless and minute. Each female lays one large egg 

 from which hatch the following spring the leaf and root forms. 



Not destructive on sandy soils. 



Control. — Spray in early spring with lime sulphur; use American varieties as 

 stock. 



3. Common Garden Aphids. 



Cabbage or Turnip Plant Louse {Aphis brassicae L.) — Often abundant on the 

 under surface of leaves of cabbages and turnips, and very destructive in warm dry 

 weather. A greenish, soft, pear-shaped insect covered with a whitish bloom. 

 Mature forms have black head and eyes and dark cornicles; nymphs are pale 

 green with black legs and antennae. Parasite, Aphidiiis rapae, a braconid. 



Aphis pseudobrassicae Davis. — Also occurs on turnip, radish, cabbage, grape, 

 mustard, etc. and is often mistaken for A. brassicae. 



Melon Plant-louse {Aphis gossypii Glov). — Occurs on the under surfaces of 

 the leaves of melon, cucumber, squash etc., and also on other crops and weeds. 

 Winter eggs have been found on purslane and strawberry. A blackish-green insect. 

 Apterous females with legs and antennae whitish, cornicles black and short; 

 winged forms with a row of black spots on sides of abdomen, and spots on head 

 and thorax. 



