372 Journal of the Department oe AuKTcn/rFRE.— Oct., 1922. 

 Yellowing of Orange Leaves. 



UitcnJiafjc. — The leaves of my oianj>e trees are luiiiiiig' yellow 

 and falling. AVliat wonld cause this? 



Grooffontein School of AgricuJiuie replies: The yellowing* of 

 the leaves may be due to " brak," too much water, or to a combina- 

 tion of these two. An analysis of the soil may help to elucidate the 

 question. Application should be made to the school for particulars 

 regarding the conditions governing analysis of soils. 



Separator. 



Bedford, C.P. — I rini commencing to supply cream and am 

 milking ten cows daily. Do you think it worth my while to buy a 

 separator for such a small amount of milk. 



Grootfontein School of Agriculture replies : To obtain top price 

 for your product it is very necessary for you to purchase a separator; 

 otherwise, in obtaining your cream by hand-skimming you will Avaste 

 a considerable portion of it, and also will never be able to produce a 

 first-grade article urrder shimmer conditions. 



The advantages of a separator over hand-skimming may be briefly 

 stated as follows: — (1) Fewer utensils are required. (2) The skim 

 milk is immediately available for stock-feeding in a fresh state. 

 (3) The butter-fat content of the cream can be regulated. (4) Much 

 less fat is lost in the skim milk. 



The fat that you Mill save duriirg the coui'se of two seasons will 

 more than pay the purchase price of a separator. In selecting your 

 separator, remember that your herd will probably grow in size, so 

 do not purchase a machine that will soon become too small for your 

 requirements. I would suggest one that wall separate from 45 to 60 

 gallons per hour. 



Fruit-Fly Spray. 



Imvaiii. — Please give me iirformation with regard to the best 

 spray ngainst fruit-fly, and also the 'oest time to start spraying. 



(rrootfo/ilcin School of A niiciil I ii re i(>oHes : Begin baiting foi' 

 Ihe friiit-fly about tliree weeks bi'foic liuit ripens nnd kee]» the trees 

 baited till about tliree weeks alter the i'ruit is oft. liei)eat baiting 

 after eveiN r;iin ;nid ;it intervals of ten days in alsence of rain. Also 

 bait other kinds of tices surrounding orchnrd to kill mother flies. 

 The bait is made as follows: — Arsenate of lead (50 y>vv cent paste), 

 2 lb., or arsenate of lead (powder), 1 lb.; treacle (crude), 3 gallons, 

 or sugar (cheapest), 25 lb. : water, 40 g\Tllons. Mix the arsenate with 

 a little water, and dissolve the sweetening agent in the remainder and 

 stir in the arsenate. Make \\\^ fresh as required and stir when using. 

 Use a garden syringe with a fine rose, and sprinkle bait in minute 

 drops over foliage; one syringeful is usually enough for each tree. 

 Fallen fruit must be destroyed. 



