Insect Enemies of Greenhouse and Ornamental Plants . 7 



According to "Mr. Dickerson, there are probably two broods in 

 New Jersey. The eggs start to hatch early in May and the nymphs 

 reach maturity early in June, and by the middle of that month or 

 shortly after all of the insects of this brood have matured. After 

 feeding and copulation, oviposition. occurs and may continue 

 through June and part of July. From these eggs, a second brood 

 of adults emerges in August and deposits the hibernating eggs. 



There are four nymphal stages, and according to Crosby and 

 ITadley, these require a combined minimum time of 25 days and 



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Fig. 7. Azalea leaf injured by the azalea lace bug 

 Fig. 8. Last stage nymph of the azalea lace bug 

 Fig. Q. The azalea lace bug, Stephanitis pyrioides Scott 



an average of 30 to mature under insectary conditions. Mr. Dick- 

 erson states that in New Jersey development appears to be more 

 rapid in some cases, especially on plants exposed to full sunlight, 

 and mentions a total minimum nymphal period of 20 days for some 

 individuals. During the first three nymphal stages, the insects 

 appear to move around very little. These bugs may be controlled 

 by applications of whale-oil soap at the rate of 6 or 7 pounds to 

 50 gallons of water, provided the spray is directed against the under- 

 sides of the leaves and applied as soon as the nymphs are noticed. 



