I 



October, 1929] ^^•HITE PIXP: WEEVIL 15 



flew about eight feet above or at about the level with the leaders. Over 

 open spaces they flew nearer the ground at an average of about five feet; 

 the longest about one hundred yards/' 



He observed that most of the flights were made to adjacent trees al- 

 though a number of weevils flew 25 feet or more above the tips and de- 

 scended at a point near the center of the pine tree. 



The same method used by Barnes was tried at this station on three 

 different occasions under ideal conditions with little success. Two weevils 

 flew 15 and 30 feet respectively. The weevils did not fly readily and 

 were inclined to remain on top of the staff. 



In the season of 1928 weevils were collected at least once a week, and 

 usually twice a week, from several of the plots under observation, in or- 

 der to secure specimens for experimental purposes. Throughout the sea- 

 son, up to the first of July, it was always possible to collect approximate- 

 Ij^ the same number of weevils from a plot. Collections from a plot did 

 not seem to materially reduce the weevil population. It seemed remark- 

 able if all of these later collections were made up of weevils previously 

 overlooked. On the other hand, few white pines of the more susceptible 

 ages were in the immediate vicinity of these plots. The following ex- 

 periments suggest that weevils may be overlooked, even when search is 

 repeated and thorough. 



Fifty weevils, their elytra marked with red paint, were liberated June 

 16. 1928, about one foot from the ground on a five foot white pine tree, 

 located in the center of the Madbur}- plot. On the same day 50 white- 

 marked weevils were liberated on a four foot tree, the only white pine 

 in a large field adjoining the Madbury plot on the east. This tree was 

 at least 150 yards from the nearest pines located in the above plot. 



June 18, twenty-three red-marked weevils were found on the tree on 

 which they were liberated and 31 white-marked weevils were taken from 

 their tree. Careful scouting failed to reveal any marked weevils on any 

 of the other trees in the plot. 



When these trees were next examined, June 21, six additional white 

 and seven red-marked weevils were taken from their respective trees. 

 June 26 two more white and four red-marked weevils were taken. An- 

 other red weevil was collected June 28. 



Thus a total of 38 red and 39 white-marked weevils of the original 50 

 liberated on each tree were recovered in a period of 12 days, all from 

 their respective trees. 



EGG STAGE 



The period when eggs may be found extends from the time when ovi- 

 position begins in the spring to about ten days after the weevils finish 

 ovipositing in July. (Chart 1). 



Considerable data were secured on the length of the egg stage by util- 

 ization of the plaster-of-Paris blocks already described. Observations on 

 the length of the egg stage, and to a less extent subsequent stages, deter- 

 mined bv this method, are open to a certain degree of error insofar as 



