HAXDBOOK OX INSECT ENEMIES OF FLOWERS AND SHRUBS 25 



Figure 38. — Blisters produced by the 

 boxwood leaf miner on the lower leaf 

 surface. About 4 times natural size. 



Boxwood Psyllid 



A characteristic cupping of terminal 

 boxwood leaves results from the feeding 

 of the boxwood psyllid (Psylla buxi 

 (L.)). This is a small, grayish-green 

 sucking insect related to the aphids. 

 The nymphs are covered with a whitish 

 waxy material and usually appear first 

 in early spring. Plants are seldom in- 

 jured seriously, although their appear- 

 ance may become unattractive. Severe 

 infestations may retard growth. 



Treatment.— Spray with a nicotine 

 sulfate and soap solution (p. 97) at the 

 first evidence of leaf cupping or occur- 

 rence of the psyllid. A second or third 

 spraying, at intervals of 10 days, may 

 be necessary for a heavy infestation. A 

 pyrethrum spray should also be effective. 



Other Pests of Boxwood 



Page 



Spider mites.. 11 



Giant hornet 57 



Mealy flata 90 



CALENDULA 



Painted-Lady 



The caterpillar of the painted-lady 

 butterfly (Vanessa cardui (L.)) feeds on 

 the foliage of calendula, hollyhock, 

 lupine, and sunflower, and occasionally 

 on other plants. It also ties together 

 the terminal leaves, giving the plant an 

 unsightly appearance. This insect is 

 also common on weeds, especially on 

 thistle, and is sometimes called the 

 thistle butterfly. The full-grown cater- 

 pillar (fig. 39) is about V/t inches long, 

 dull brown or black, shiny, with a 

 pale-yellow stripe on each side. The 

 adult is a large, beautifully marked 

 butterfly. It is widely distributed and 

 sometimes occurs in migratory flights. 



m 



Figure 39. — Caterpillar of the painted 

 lady butterfly and its work on 

 hollyhock. About natural size. 



Treatment. — Spray or dust with 

 lead arsenate. Where only a few insects 

 are present, remove and destroy the 

 infested tips. 



Other Pests of Calendula 



Pace 



Black blister heetle 20 



Tarnished plant bug 35 



Spotted cucumber beetle 7 



Yellow woolly bear 3 



Stalk borer 34 



Bean aphid 63 



Green peach aphid 8S 



Root aphids 21 



Leafhoppers 10 



Flea beetles 8 



Red spiders 11 



Greenhouse whitefly... IS 



