230 SECOND THOUSAND QUESTIONS IN AGRICULTURE 



Pear Blight. No spray effective. The only treatment consists in 

 cutting off blight as fast as it appears. Cut below affected parts so 

 that good live wood is secured. Sterilize implements after each cut by 

 dipping them in corrosive sublimate. 



Apple Mildew. Cut off infested tips both winter and summer, also 

 prune back all twigs somewhat as apricots are pruned. Spray with 

 milled sulphur in spring. 



Sappy Bark. Cut away diseased parts when trees are dormant. 



Scab. Apply strong Bordeaux before buds start. Spray again 

 with weaker Bordeaux as soon as the blossoms fall. Repeat several 

 times at intervals of three or four weeks. (This should be done 

 especially if the weather is damp.) 



Citrus Fruits. 



All scale insects and mealy bugs on citrus trees, commercially 

 grown, are fought by fumigation with hydrocyanic gas, which see on 

 a previous page. 



Fuller's Rose Beetle (Aramigus fulleri). This insect cannot fly 

 and can be kept from the trees by means of tanglefoot bands. 



Orange Aphis. Spray with kerosene emulsion or tobacco extract 

 as soon as found. 



Red Spider (Tetranychus mytilaspidis. Apply milled sulphur or 

 dilute commercial lime-sulphur when foliage is damp. Repeat until 

 pests disappear. A new practice which has given excellent results is 

 obtained by adding flour to the spray as follows: four pounds flour 

 to 100 gallons water. Make a paste of the flour, using the proportion 

 of one pound flour to one gallon cold water, strain and add in propor- 

 tion required to each tank of spray material. The advantage in 

 using flour is that it prevents the spotting so often noted in use of 

 lime-sulphur spray, which injures the fruit, and spreads in a thin film 

 over the tree. 



One pound of dextrine to 100 gallons of water may be used in 

 place of the flour. 



White Cottony Cushion Scale. This pest is handled perfectly by 

 its natural enemy, Novius cardinalis, commonly called the '"Vedalia," 

 which may be had from the State Insectary, Sacramento. Release 

 colony at any time of year scale appears. 



White Fly. Defoliate trees when the larvae appear and scrub 

 with soap washes. Better to fumigate with hydrocyanic gas. 



Thrips. Spray with tobacco extract in spring. 



Army Worms. Apply poison baits under trees; also if they have 

 not already secured access to orchard, surround trees with deep furrow, 

 vertical side toward trees. If cover crops are growing, remove such 

 growths as project up into branches of the trees. Paint tanglefoot 

 bands around tree trunk. 



Brown Rot. Sow cover crop in orchard. Plow under in spring 

 and cultivate well under the trees. In washer use bluestone, or 



