Circular 100 



dodendrons exported from America and is frequently noted in the 

 egg stage on rhododendrons received into this country from Holland. 

 It occurs on mountain laurel (Kalmia latifolia), the rhododen- 

 dron, (Rhododendron maximum) and many of its varieties. The 

 nymphs and adults inhabit the under-sides of the leaves and by 

 feeding cause a light, mottled spotting of the upper surfaces. In 

 addition the under-sides of the leaves are disfigured with numerous, 

 small, dark, varnish-like spots of excrement. The insect over- 

 winters in the egg stage, the eggs being somewhat irregular, eylin- 



Fig. 4. Under surface of rhododendron leaf showing spotting due to 



the rhododendron lace bug 

 Fig. 5. Last stage nymph of rhododendron lace bug 

 Fig. 6. The rhododendron lace bug. Leptobyrsa rhododendri Horv. 



(Fig. 5 and 6, redrawn from Crosby &~Hadley) 



drical and flask-shaped, oval in general outline with a rather broad 

 neck-like elongation at the outer end turned to one side. They are 

 about 0.4 mm. long, pale, yellowish white, and are inserted in the 

 lower leaf surface, usually along the mid-rib, with the truncated 

 cud of the neck-like portion extending slightly above the leaf sur- 

 face. This is capped with a varnish-like material which later har- 

 dens into a small scab-like object. 



