60 



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



hang down and wilt. It also eats large 

 holes in the leaves. The caterpillars 

 hide during the day in shelters made by 

 folding and rolling the wilted leaves. 

 In the evening they come forth to feed. 

 In heavy infestations the plants become 

 unsightly from the drooping and dying 

 foliage. The caterpillar is greenish, 

 with dark spots on the body, and is 

 about % inch long when full-grown. It 

 resembles somewhat the garden web- 

 worm (fig. 153, p. 90). The adult is a 

 yellowish moth with faint brownish 

 markings. This insect is also recorded 

 as feeding on dahlia, hogweed, pepper- 

 mint, spearmint, sunflower, violet, wan- 

 dering-jew, and zinnia. 



Treatment. — Spray or dust with 

 lead arsenate to kill the young cater- 

 pillars. When the caterpillars are large, 

 hand-picking is often sufficient to con- 

 trol them. 



Other Pests of Morning-Glory 



Page 



Melon aphid 90 



Yellow woolly bear r 3 



Spotted cucumber beetle 7 



Asiatic garden beetle 21 



Corn earworm 29 



Four-lined plant bug 91 



Garden flea hopper 80 



Greenhouse whitefly 18 



Red spiders.. 11 



MOUNTAIN-LAUREL 



Some of the more common insects 

 that attack mountain-laurel also attack 

 rhododendron or azalea and are dis- 

 cussed mostly under those plants or in 

 the places indicated below. Page 



Rhododendron lacebug_. . 73 



Mulberry whitefly 22 



Rhododendron borer ^ 73 



Azalea stem borer 24 



Black vine weevil 93 



NARCISSUS 



Narcissus Bulb Fly 



Of the several species of bulb flies that 

 attack narcissus and other flowering 

 bulbs, the narcissus bulb fly {Lam-petia 

 equestris (F.)) is the most important. 

 The maggots of this species usually feed 

 in the center of the bulbs (fig. 97) and 

 are not detected until the injury is well 

 advanced. The foliage turns yellow and 

 is stunted, or at times no growth what- 

 ever develops. The legless maggots are 

 dirty white or yellowish and about % 

 inch long, whereas the pupae are elon- 

 gate, grayish brown, and segmented. 

 Normally only one maggot inhabits a 

 bulb, but two or three may be found. 

 Infested bulbs usually feel spongy when 

 squeezed. The larvae overwinter in the 

 bulbs and come forth to pupate at the 



Figure 97. — Maggot of the narcissus 

 bulb fly and its work in the interior of 

 a bulb. Slightly reduced. 



Figure 98. — Adults of bulb flies. A, 

 Lesser bulb fly; B, narcissus bulb fly. 

 About twice natural size. 



soil surface late in the spring. The adults 

 (fig. 98, B), which appear a little later, 

 resemble bumblebees. Bulbs attacked 

 in addition to narcissus include amaryl- 

 lis, hyacinth, iris, tulip, and several 

 others. 



Treatment. — Cull out all visibly 



