EXPERIMENT STATION EEPORT. 535 



An interesting experiment was made, when, after the first hrood of 

 the vaporer moth had hatched and egg masses began to appear on the 

 trees, a reward of ten cents per quart was offered for egg-masses, to be 

 brought to a specified point at a specified time. Mr. Carl Bannwart, 

 who was in general charge, reports that altogether a little less than 

 $20 was expended. By actual count, one lot of two quarts 

 contained 387 egg-masses, and a three-quart lot sent to me contained 

 425 egg masses, the balance being made up of cocoons, pupae and the 

 like. This makes an average of 166 egg-masses per quart. At my 

 request, Mr. Dickerson counted the eggs in four masses of average size, 

 obtaining as the result 369, 412, 327, 470, or an average rate of 349 

 eggs per mass. At that rate each average quart would contain about 

 65,404 eggs, and the 200 quarts for which $20 was paid, pur- 

 chased 13,080,800 eggs. This is not exactly a bad investment, 

 especially as experiments showed that most of the eggs were viable. 



In East Orange the spraying outfit is modeled after that employed 

 by Mr. E. B. Southwick, the Entomologist to the New York Park 

 System, and a three horse-power Daimler gasoline engine furnishes 

 the power. The cottony maple scale was the species more particularly 

 aimed at there, and, instead of using an insecticide, a solid small jet 

 was used to dislodge the insects when they became prominent. Two 

 nozzles employed in this way cleaned a good-sized tree in twenty min- 

 utes. This method has the merit of simplicity and safety to foliage, 

 and seems to have been very successful. In towns and cities with good 

 water pressure, an ordinary garden hose could be used to good purpose 

 for the same end. 



In other cities and towns throughout the State various measures 

 were adopted. Sometimes the governing bodies of the municipality 

 provided the necessary funds, but quite frequently local improvement 

 associations attended to the work from funds paid in by members or 

 from those whose trees were treated. 



OYSTER-SHEI.Ii BARK-LOUSE. 



The oyster-sliell harh-louse as a shade-tree pest has not been here- 

 tofore especially troublesome; indeed, except on some butternut and 

 walnut in the northern counties, it has been a negligible quantity. 

 When it occasionally became rather plentiful on some orchard trees, a 

 single treatment in June was advised and was generally all that was 



