154 



PESTS OP MISCELLANEOUS FIELD CROPS. 



FIG. 171. 



Diamond Sack Moth. 

 (Natural size and magnified.) 



folded, the light marks on the wings come together forming the 

 characteristic diamond marks along the upper surface, from which the 



moth takes its name. The moth may be 

 seen in the fields flying from plant to 

 plant or resting on the plants. There are 

 several broods in the year, overlapping irre- 

 gularly, so that insects of all ages are found 

 at the same time. Probably there are at 

 least eight and possibly twelve generations 

 in a year, the insect being active through 

 the cold weather and continuing its life 

 history as at other times. 

 Remedies. The pest is a serious one to growers of cabbage, mustard, 

 radish, and similar crops raised for sale in the bazaars. The cabbage 

 crop suffers heavily, the plants 

 being frequently badly attacked, 

 the leaves spoilt, and the crop 

 unsaleable. The cultivator's 

 remedy of picking the larvae is 

 effective but very tedious. Better 

 results are obtained with spray- 

 ing, and the simple tin hand 

 sprayer made in the bazaar at a 

 cost of rupee one annas twelve is 

 eminently adapted for this work. 

 The best insecticide is Messrs. 

 McDougal & Co/s Insecticide and 



Fungicide. Kerosene emulsion is effective and also pyre- 

 thrum powder (or Keating' s insect powder) used as a 

 stomach poison at the rate of 1 oz. to 1 gallon of water. 

 Where such work is done intelligently, the use of lead 

 arseniate is by far the best remedy, but owing to its 

 poisonous effect if applied in excessive quantities this 

 insecticide cannot be generally applied. Where spraying 

 is not possible a dressing of ashes, applied by hand to 

 the underside when the plants are wet, is effective in 

 preserving the leaves from the caterpillars. A good 

 FIG. 173. and safe application is tobacco and soap or tobacco 



Pupa of Callage decoction, made by soaking refuse tobacco in cold water 

 oTcall^/^eaf^undfr at tlie rate o ! #> to 5 gallons and adding soap suds 

 a silken web. made by mixing | Ib. soap in 1 gallon of water* 



FIG. 172. 



Semi-looker Caterpillar that eats callage. 

 (Magnified four times.} 



