29 



safe in dry climates when the temperature does not exceed 100°F. ; 

 above that point there seems to be an element of risk. It was noticed 

 also that the most severe scorching occurred where the vitality of the 

 trees was low, either owing to poor soil, lack of moisture or other 

 unfavourable soil conditions. The injury under consideration seems 

 therefore to have been caused by a combination of conditions, namely, 

 sulphur, lack of vigour in the tree, and unusual heat. 



Brosius (F. C). Wormy Pears are condemned in Sacramento County. 



— Mthlif. Bxdl. Col. State Co)mmss. Hortic, Sacramento, vi, no. 10, 

 October 1917, pp. 408-410. 



The pear crop of 1917 in Sacramento was unusually abundant, but 

 was hea\a]y infested with the larvae of codling moth [Ci/dia pomonellu], 

 the exact cause of the severity of the infestation being unknown. 

 Entire consignments were sorted and repacked at the docks before 

 shipment ; a memorandum gives the percentage of infestation in 

 each box coimted and the number of boxes in each consignment that 

 were condemned. It is intended in future not to allow over 3 per cent, 

 infestation in any packed box of pears. 



Maskew (F.). Quarantine Division. Report for the Month of July, 



1917. — Mthly. Bull. Cal. State Commiss. Hortic, Sacrainento, vi, 

 no. 10, October 1917, pp. 413-414. 



The follo\\ang pests were intercepted : — From Central America : 

 Aspidiotus cyanophylli, A. cydoniae, Chrysomphalus scutiformis and 

 Pseudococcus sp., on bananas. From China : Weevil larvae in sweet 

 potatoes ; Lepidopterous larvae in dried herbs ; weevil and Lepi- 

 dopterous larvae in dried potatoes ; weevils in roots. From Hawaii : 

 Diaspis bromeliae and Pseudococcus hromeliae on pineapples ; Coccus 

 longidus on betel leaves ; Trypetid larvae in mangoes and string 

 beans ; weevils in seed pods. From Japan : Coccids on a pot plant. 

 From Mexico : weevil larvae in beans ; Calandra sp. in maize ; 

 unidentified Lepidopterous larvae in dried bananas. From New York : 

 Diaspis boisduvali on orchids ; Saissetia^ oleae on Cycads. From New 

 Jersey : Hemichionaspis aspidistrae on sago palm ; Diaspis boisduvali 

 on orchids ; Gymnaspis aechmeae on Vriesia speciosa ; Aspidiotus 

 cyanophyUi on Ananas sativus (pineapple) ; Pseudococcus sp. on 

 Medinilla magnifica and dracaenas ; Eucalymnatus tesselhtus on 

 palm. From Connecticut : Pseudococcus sp. on ornamental plants. 

 From Pennsylvania : Saissetia hemisphaerica on gardenias. From 

 South Sea Islands : Pseudococcus sp. on palms. From Tahiti : Coccids 

 on oranges. 



Gernert (W. B.). Aphis Immunity of Teosinte-Corn Hybrids. — 

 Science, Lancaster, Pa., xlvi, no. 1190, 19th October 1917, 

 pp. 390-392. 



Aphis maidi-radicis (maize root-aphis) and A. maidis (maize plant- 

 aphis) are two very destructive species, there being probably no 

 maize-growing region of importance in N. America that is free from 

 the former, which sometimes causes total failure of the crop in limited 

 areas. From eleven to twenty-two generations have been found in 

 one season, and it is estimated that each individual hatched in the 



