Departmental Activities. 39 



Spraying and Dusting for Control of Fusicladium, Season 



1921-22. — The following- is a brief summary of the work carried 

 out during" the past season in the pear orchard: — 



Variety: Louise Bonne. 



Plot I (average count of two trees). — Dusted twice with 12 lb. 

 copper sulphate and (S8 11). lime before blossoming, and twice with 

 the above mixture, plus lead arsenate, using 10 lb. CuSO^, 75 lb. 

 lime, 15 lb. lead arsenate, and three times with lime and lead 

 arsenate, viz., 85 lb. lime and 15 lb. lead arsenate. 



Total fruit, 1203; fusicladium, 137; codling, 030; percentage 

 scab, 11.3; percentage wormy, 52. 



Plot II (Uvn trees). — Sprayed twice before blossoming and twice 

 after (De Beers bordeaux) with usual sprays of lead arsenate. 

 Total fruit, 2000; fusicladium, percentage scab, 3.7. 



Plot III (tliree trees). — Spiayed with ordinary bordeaux (4:4: 50) 

 twice after blossom with I5 lb. lead arsenate in 40 gallons l>ordeaux of 

 4:4:50 strength, plus three sprays 1^ lb. lead arsenate in 40 gallons 

 water. 



Total fruit, 2424; fusicladium, 109; codling, 179; percentage 

 scab, 2.0; percentage codling, 5. 



Plot IV (three trees). — Sprayed twice before blossom, Capex 

 (1:45), and twice after, Capex (1:50) with 1-h lb. lead arsenate in 

 50 gallons water. T^ast three sprays 1^ lb. lead arsenate in 40 

 gallons water. 



Total fruit, 4230; fusicladium, 112; codling, 214; percentage 

 scab, 2.G; percentage codling, 5. 



Clieck Tree. — Uiisprayed. 



Total fruit, 391; fusicladium, 109; codling, 280; percentage 

 scab, 43; percentage codling, 71. 



Variety : Forelle. 

 Three plots, plus a check tree, were taken. 



Plot I (two trees). — Sprayed twice before blossom, bordeaux 

 (4:4:50), twice after blossom with li lb. lead arsenate in 40 gallons 

 bordeaux, and three later sprays 1^^ lb. lead arsenate in 40 gallons 

 water. 



Total fruit, 1301; fusicladium, 76; percentage scab, 5.8. 



Plot II. — Sprayed twice before blossom with ('orona bordeaux 

 ])owder, and twice after blossom \vith similar mixture. 



Total fruit, 1843; fusicladium, 100 ; percentage scab, 5.8. 



Plot III (two trees) .^ — Sprayed twice lief ore blossom with Capex 

 (1 :50), twice after blossom with 11 lead arsenate in 45 gallons Capex. 

 Total fruit, 1116; fusicladium, 9; percentage scab, 8. 



Check Tree. — Total fruit, 383; fusicladium, 83; percentage 

 scab, 21. 



Conclusions. — (1) Infestations of fusicladium, in so far as 

 Elsenburg is concerned, were not sufficiently severe to give very 

 reliable results regarding the tests of efficiency of the different sprays, 

 and powders. (2) De Beers bordeaux powder, made up into spray 

 form, is as effective as ordinary home-made bordeaux. (3) Capex 



