ae Yas 
Analysis of sulphur residue.—-"During the month of June two analy— 
ses were made" by Ralph L. Miller and Ione Pope Bassett, of the Orlando 
laboratory, “of the sulphur residue remaining on the citrus foliage af— 
ter it had been sprayed with solutions of lime sulphur and various adhe— 
sive materials. It was found that those mixtures ccntaining kaolin and 
iron sulphate were by far the most satisfactory. In the case of the ka-— 
olin mixture, there was nearly three times as much sulphur present as 
when lime sulphur alone was used." As reported previously, none of the 
spreaders used was of any advantage in increasing the adhesiveness of 
sulphur, while some actually decreased the residue. 
Control of tarnished plant bug on pears.--A. R. Rolfs, who has been 
conducting investigations of the tarnished plant bug (Lygus pratensis 
.) on orchard crops at Yakima, Wash., reports: "A 20-acre block mor 
pears was subjected to heavy disking late in November, all trash being 
previously scraped away from the tree trunks and turned under by the 
disks. No treatment was given in the Sree: An adjoining pear or- 
chard having a heavy alfalfa cover crop last year was not treated in 
any way. Both orchards suffered severe damage from the tarnished plant 
bug last year. An examination was made on June 20 of 1,100 pears on 
the trees in each orchard; 13.7 per cent were found injured in the un— 
treated orchard and 3.9 per cent injured in the treated orchard. The 
difference was so marked that it could be noted by a casual examina— 
tion of the two orchards. This treatment may be of some practical value, 
but it can not be used annually on account of the adverse effect on the 
cover crop.” 
(= 
Work with oriental fruit moth parasites.—-The oriental fruit moth 
parasite investigations headquartered at Moorestown, N. J., as reported 
by H. W. Allen, concerns for July receipt of two aerenantgiiwitis from G, J. 
Haeussler, Japan, and very active work in rearing and liberating para— 
sites-—--chiefly domestic. Three new types of parasites were received 
from Japan: Dioctes sp., Macrocentrus thoracicus Nees, and a species 
of Cremastus. Notwithstanding very large mortality during transit, liv— 
ing males and females of all these types survived in some numbers. The 
Dioctes were very active and there was no trouble in getting parasitiza— 
tion of oriental fruit moth larvae in twigs, and a considerable stock of 
cocoons of this species is being assembled. Tke living individuals of 
Macrocentrus thoracicus were rather inactive but these are also parasi-—- 
tizing twig-infesting molesta larvae. The Cremastus is under study to 
determine its identity and to give assurance of its being safe for lib— 
eration. The report records also the rearing of nearly 40,000 of the 
native Macrocentrus ancylivorus Roh. and their distribution to 15 States. 
some five other parasit S were concerned in rearings and distributions. 
A parasite, Antrocephalus stokesi Cwfd., introduced from Australia, was 
found to be a secondary parasite of Macrocentrus thoracicus as well as 
primary on the larvae of the oriental fruit moth, and all breeding stock 
was destroyed. In cooperation with 13 State agencies collections of in- 
fested peach twigs have been made for the purpose of determining par-— 
asitism of the oriental fruit moth larvae, and these are being held for 
full emergence. 
