90 



MISC. PUBLICATION 626, U. S. DEPT. OF AGRICULTURE 



Figure 152. — Feeding injury caused by 

 the garden webworm. 



Figure 153. — Stages of the garden 

 webworm: a, Adult moth; b, larva, or 

 caterpillar; c, pupa. About natural 

 size. 



Melon Aphid 



The melon aphid (Aphis gossypii 

 Glov.) is a small, greenish to blackish 

 plant louse (fig. 18, p. 90). It attacks 

 many kinds of plants, including aster, 

 chrysanthemum, hollyhock, hydrangea, 

 lilac, lily, morning-glory, poppy, rose, 

 sunflower, verbena, and various vege- 

 table plants and weeds. The aphids are 

 often found clustered on the under sides 

 of the leaves and tender stems. Their 

 sucking of the plant juices causes a 

 stunting of the growth similar to that 

 caused by other aphids. 



Treatment. — See treatment for 

 aphids (p. 9). 



Other Pests of Verbena 



Page 



Green peach aphid 25,88 



Red spiders 11 



Yellow woolly bear 3 



Oblique-banded leaf roller 83 



Greenhouse leaf tier 5 



Morning-glory leaf cutter 59 



Blister beetles 7 



Flower thrips 74 



Greenhouse whitefly 18 



Greenhouse orthezia 32 



VIBURNUM 

 Aphids 



When the young leaves of viburnum 

 are badly curled or deformed and dis- 

 colored by a sooty fungus early in the 

 spring, it is an indication that the snow- 

 ball aphid (Anuraphis viburnicola (Gill.)) 

 is probably infesting the plant. This 

 aphid varies in color from an ash gray 

 to a dark green. Usually the infesta- 

 tion subsides late in June, at which time 

 the winged forms move to other host 

 plants to spend the summer. 



Another species, Aphis viburniphila 

 Patch, lives on snowball and other vi- 

 burnums the entire season, although it 

 is most abundant during the early sum- 

 mer. This aphid causes injury similar to 

 that caused by the snowball aphid. The 

 eggs are laid late in August in the leaf 

 stems and between terminal stems. 



Treatment. — Spray or dust on the 

 first sign of injury, or when the young 

 leaves are about half an inch long, using 

 the remedies suggested for aphids, or 

 plant lice, on page 9. 



Mealy Flata 



Viburnum plants may at times be- 

 come untidy in appearance owing to 

 infestation by one or more species of 

 lantern flies. The mealy flata (Ormenis 

 pruinosa (Say)) is often the chief of- 

 fender. It feeds also on boxwood, 

 catalpa, dahlia, privet, salvia, and other 



