279 



A borer, probably Rhabdocnemis obscura (sugar-cane borer), was 

 found in the north and east, where it has evidently been for some time. 

 This pest bores holes at the base of coconut leaves. A large green 

 walking stick insect was thought to be responsible for damage to 

 coconut leaves, but the insect was not found in sufficient numbers 

 to account for the extensive damage occurring in short periods in 

 some groves. 



On the island of Saipan, Aspidiotus destructor attacked coconut 

 palms and the fruit and foliage of banana, papaw and breadfruit 

 trees. 



Weiss (H. B.) & Lott (R. B.). The Juniper Webworm, Ypsolophus 

 marginellus, Fabr. (Lepid., Gelechiidae). — Ent. Neivs, Philadelphia, 

 Pa., xxxiii, no. 3, March 1922, pp. 80-82. 



During the last few years Dichomeris {Ypsolophus) marginellus, F., 

 has been increasing in New Jersey and causing considerable damage 

 to the foliage of several varieties of juniper. The first moths emerge 

 about the end of May and are most abundant towards the middle of 

 June. The eggs are usually laid singly on the new terminal growth 

 in the axil formed by the stem and the leaf, though they may also be 

 found on the shoots or stems. The first larvae appear about 8th July 

 and feed on the upper epidermis of the small leaves, causing them to 

 turn brown. Towards the end of July the webs are plainly visible. 

 Hibernation occurs in the partly grown larval condition in the webbed- 

 up foliage. The larvae become active again early in May in northern 

 New Jersey, and pupation begins from the middle of May, lasting 

 about 15 days. There appears to be only one brood in the year. 



Infested plants should be dusted with lead arsenate during the end 

 of June or beginning of July, when the webs are small. For later 

 apphcations sprays must be used. On some varieties of juniper the 

 dried nests containing larvae may be cut and burned early in the spring. 



Reyne (A.). De Caeaothrips {Heliothrips rubrocinctus, Giard). — 

 Dept. Landbouiv, Suriname, Paramaribo, Bull. 44, August 1921, 

 214 pp., 20 plates, 6 figs. (With a -Summary in English.) 

 [Received 20th March 1922.] 



Of late years means have been found to combat the witchbroom 

 disease of cacao in Surinam, and the damage done by the cacao thrips, 

 Heliothrips rubrocinctus, Giard, has become more and more evident, 

 much loss formerly attributed to the disease being due to it. The 

 first section of this monograph surveys the distribution and damage 

 done in other countries by H. rubrocinctus, which occurs in all cacao 

 plantations in Surinam. This is followed by descriptions of its various 

 stages, bionomics and control. Insecticides and limiting natural 

 factors are discussed. Though much has been published on this pest, 

 manv points have remained uninvestigated. 



At 20-30° C. [68-86° F.] the egg stage lasts 10-13 days. The 

 larval stage usually requires 9-10 days. The prepupal stage lasts 

 about 24 hours, and the pupal, 2-3 days. The adult has an average 

 life of one month, with observed maxima of 46 days for the female 

 and 39 for the male. In regular counts from January 1919 to June 

 1920 only 77 males occurred among 29,100 females (0-26 per cent.). 



