New YorK AGRICULTURAL EXPERIMENT STATION. 303 
TABLE II].—LENGTH OF PERIOD OF GROWTH OF SAN JOSE SCALE LARVA. 
ms ee eo Date began to reproduce, cab Remarks. 
1 Sept. 6 Oct. 24. 48 On apples in laboratory. 
7) 66 6 6é oT. 51 6 66 
3 eG) None'to Dee.’ 31. f hibernating. 
4 id iy ? ‘ss in adult stage. 
5 66 6 ‘é 6é 66 é6 
6 66 6 66 66 6é me 66 
7 ee Oct. 28. 52 ne ib 
8 “ ~66——sSNNoonne tto Dee. 31, hy a 
9 co 6 6c 6s 66 ‘é 
10 eG Oct. 25, 49 f if 
11 “ 6 None to Dec. 31. ie A 
12 6é § 66 6c“ ; éé 6é 
13 ey Oct. 29. 53 af 
14 « 7 On Nov. 11 had 25 larves i. * 
15 “« 6 = None to Dee. 31. i ¢ 
16 Nos. 16, 17, 18 kept in 
17 Arie’ (28 Oct. 7 had together 101 one cage and were over- 
18 ° larve. looked until Oct. 7. On 
a apple tree in insectary. 
19 Ae Oct. 12. 44 On apple tree in Ay 
Average 49.5 days. 
The table shows that but ten or a little more than half of these 
females produced larve. With these, however, the period from 
date of settling down until young were produced was fairly uni- 
form varying from 44 to 53 days with an average of 49.5 days. 
At Plate XLVIII, Fig. 1, some larve are shown that have just 
settled down and are about to begin forming scales. 
It is during this period also that the discoloration of the tissue 
begins. The irregular blotches produced by the young scales 
individually and collectively on fruit and leaves are shown at 
Plate XLIX, Fig. 6 and Plate LI, Fig. 2. 
Formation of the scale-—In the formation of the scale by the 
female there were usually apparent four well defined stages 
based upon its outward appearance as follows: (1) The white or 
fluffy stage, (2) the tufted stage, (5) the black stage and (4) the 
fully formed stage. 
The white or fluffy stage——The first indication of the formation 
of the scale is the secretion of white cottony filaments that cover 
the body at first sparingly but finally become quite dense until 
the insect has the appearance of a white oval mass of fluffy cot- 
