352 The Spraying of Plants. 



in accomplishing that which each alone could not have done. 

 There appear to be several broods of the beetles each season. 



Treatment. No uniformly effective remedies are known. 

 Good results have been obtained by dusting the young plants, 

 while wet, very freely with tobacco dust. Arsenites have also 

 been recommended, as well as lime, ashes, plaster, and kerosene 

 emulsion. Bordeaux mixture and soap has given good results 

 in certain cases when thoroughly applied. 



FUNGOUS DISEASES. 



The privet is comparatively free from fungous diseases, one 

 form of blight which occasionally appears rather suddenly being 

 the most serious. It is probably due to Phyllosticta Ligustri, Sacc. 

 Little attention has been given it, but the use of Bordeaux mix- 

 ture is the most promising line of treatment. 



INSECT ENEMIES. 



Privet Web-worm (Margarodes quadristigmalis, Gn.). De- 

 scription. The adult moth is almost entirely white, a narrow 

 brown line marking the anterior edge of the front wings ; there 

 are also a few brown dots and markings at the outer edges of 

 both pairs of wings. The body is almost entirely white. It is 

 nearly five-eighths of an inch in length, the wings expanding 

 about one and one-fourth inches. Eggs are laid in spring, near 

 the mid-vein of the leaves ; they hatch in less than a week, and 

 the larvae immediately begin to feed upon the foliage. They 

 vary in color from yellowish-green to a very dark green, while 

 along the back are situated two rows of small black warts. The 

 head is yellowish-green. The caterpillars feed for about three 

 weeks ; they then pupate, the moth appearing about eight days 

 later. There are at least four broods of this insect each year in 

 the latitude of Washington. 



Treatment. The free use of arsenites or of kerosene emulsion 

 will undoubtedly exterminate the insect if the work is begun 

 when the first larvae are seen in spring. 



FUNGOUS DISEASES. PUMPKIN. 

 Powdery Mildew. See under MUSKMELON. 

 INSECT ENEMIES. See under CUCUMBER. 



