225 



Gravatt (0. F.) L^ Posey (G. B.). Gipsy-moth Larvae as Agents in the 

 Dissemination of the White-Pine Blister-Rust. — JL Agric. Research, 

 Washington, D.C., xii, no. 7, 18th February 1918, pp. 459—462.^ 



The white-pine blister-rust {Cranartium ribicoh) attacks pines 

 ranging from young seedlings to mature trees 80 ft. high. The e^rly 

 occurrence of telia on the leaves of gooseberry and currant bushes, and 

 the fact that the organism is not definitely known to winter on these 

 plants, point to the spread of the disease by aeciospores from pines. 

 The period of aeciospore production coincides with that of the hatch- 

 ing of the larvae of the gipsy moth [Lymantria dispar], which eat 

 away the spores and hyphae of the pine blisters, carrying away thou- 

 sands of spores both on and within their bodies, the viability of the 

 sjDores remaining unimpaired for a considerable time. 



Though wind is considered to be the most important factor in the 

 dissemination of the aeciospores of blister-rust from the pine to the 

 alternative host-plants, Ribes spp., yet the fact that gipsy-moth larvae 

 may be blo^Ti by winds for distances of 20 miles suggests that they 

 undoubtedly play an important part in the sj)read of the disease. 

 This view is strengthened by the facts that gipsy-moth larvae have 

 been found feeding on the leaves of Ribes spp., in some cases the only 

 infected leaves on these plants being those showing insect injury ; 

 that their habit of feeding and crawling on the lower surface of the 

 leaves gives the spores carried on their bodies a good chance of causing 

 infection through the stomata ; and that a small percentage of larvae 

 collected from species of Ribes near infected pines actually showed 

 aeciospores on their bodies. 



FuLLAWAY (D. T.). Division of Entomology. — Hawaiian Forester & 

 Agriculturist, Honolulu, xv, no. 1, Januarv 1918, p. 7. [Eeceived 

 23rd March 1918.] 



During the month of December the insectary handled 35,300 pupae 

 of the melon fly [Daeus cucurbitae], from which were bred 1,697 indi- 

 viduals of Opius fletcheri. The parasites distributed included : — • 

 Opius fletcheri, 2,127 ; Diachasma. tryoni, 685 ; D. fullawayi, 255 ; 

 Tetrastichus, 500 ; and Paranagrus (corn leaf-hopper parasite) 28,000. 



LiZER (C). Sobre la Presencia del Chrysomphalus pauJistus, Hemp., en 

 el Delta del Parana. [On the Presence of Chrysomphalus paulistus, 

 Hemp., in the Parana Delta..]— Physis. Buenos Aires, ii, no. 12, 

 30th December 1916, pp. 432-433. 



The occurrence of Chrysomphalus paulistus, Hemp., is recorded on 

 cultivated plants such as Laurus nobilis, L., and Oka europaea, L. 

 A minute Acarid has been obser\'ed apparently feeding on the eggs 

 of this Coccid. 



LizER (C). El Ceroplastes grandis, Hemp., nuevo para la Fauna 

 Argentina. [Ceroplastes grandis. Hemp., new to the Argentine 

 Fauna.]. — Ph y sis, Buenos Aires, ii, no. 12, 30th December 1916, 

 p. 438. 



The Coccid, Ceroplastes grandis, is recorded from Argentina on 

 Ilex paraguariensis. 



{C472) Wt.P2/137. 1,500. 6.18. B.&F.Ltd. G.11/3. A 



