141 



leaves, autumn ploughing to destroy larvae and pupae in remaining 

 stems and leaves, and burning dry grasses along fences and roadsides 

 in late autumn and early spring. 

 A bibliography of 14 works is given. 



Pole Evans (J. B.). The Causes of the Failure of Locust Fungus. 



[Extract from the Presidential Adress, Section C, of the Report of 

 the South African Association for the Advancement of Science.] — 

 South African Jl. Science, Cape Town, xiii, no. 3, October 1916, 

 p. 100. [Received 15th January 1917,] 



It is stated that the author's investigations have disclosed the fact 

 that the cultivated locust fungus which has for years been distributed 

 among the farmers of Cape Colony and Natal is not Empusa grylli, 

 Fres., which causes locust disease, but a species of Mucor which 

 experiments have shown to be quite innocuous to the insects. 



Webster (R. L.). Potato Insects. — Iowa State Coll. Agric. Expt. Sta., 

 Ames, Bull. no. 155, May 1915, pp. 359-420, 43 figs. [Received 

 17th January 1917.] 



Those pests which attack the foliage of potatoes include : — The 

 Colorado potato beetle {Leptinotarsa decemlineata, Say), which is 

 preyed upon by a bug, Podisus macidiventris, and its eggs eaten by the 

 Coccinelhd, Hippodamia convergens ; the potato flea-beetle {Epitrix 

 cucumeris, Harr.), which also attacks the common nightshade {Solannm 

 nigrum); the blister beetles {Epicauta vittata, F., E. cinerea, Forst., 

 and E. pennsylvanica, De G.) ; the Sphingids, Protoparce {Phlege- 

 thontius) quinquemacidata, Haw., and P. sexta, Joh., of which the latter 

 is parasitised by a Braconid, Apanteles congregatus, Say, and two 

 secondary parasites, Mesocliorus apriliniis and Hijpopieromalus 

 riridescens ; the cabbage looper, Phytometra (Autographa) brassicae, 

 Ril. ; the variegated cutworm, Lycophotia {Peridroma) margaritosa 

 Haw. ; and the cotton cutworm (Prodenia ornitJiogaUi, Guen.). 



Those which suck the sap from the foliage are : — The apple leaf- 

 hopper {Empoasca mali, Le B.), which is preyed upon by the larvae of 

 the lacewing flies and by TripJdeps insidiosus ; the potato Aphid 

 {Macrosiphum solanifolii, Ashm.), which has also been recorded on 

 cultivated iris and gladiolus, as well as on peas, shepherd's purse, and 

 two species of wild ground cherry {Phjsalis) and is preyed upon by the 

 Coccinellid, Hippodamia convergens, and parasitised by Ajjhidius 

 polygonuphis. Fitch ; the dusky leaf-bug [Adelphocoris rapidus, Say) ; 

 the tarnished plant bug [Lygus prafejisis, L.). 



The potato stalk weevil {TricJiobaris trinotata, Say) attacks the stalks 

 and also infests the ground cherry {Physalis p>uhescens) and may be 

 found on egg-plant {Solanum melongeyia), horse nettle {S. carolinense) , 

 bull nettle {S. rostratum), jimson weed {Datura stramonium), purple 

 thorn apple {D. tatida) and cockleburr {XafUhium canadense). White 

 grubs {Lachnosterna spp.) attack the roots and tubers. 



The control measures in general practice are reviewed. Formulae 

 for using lead arsenate in paste or powder, Paris green, kerosene 

 emulsion, soap solutions. Black Leaf 40, poisoned baits and Bordeaux 

 mixture are given. 



A bibliography of 73 references is appended. 



