Reports to the Boarit of .-1 gricitltiwc. \ 7 



every year. The e<j;<;.s liiid in the spring arc jiI.k i-il mi jiU kinds tif 

 Cru cite lie ; the hirvie feed iHMtii the leaves; they are dull, smoky 

 yellow cix*atures, slit,ditly hairy and spotted with Mack, the head and 

 the SIX lei,'s are also l)lack ; there is also a distinct caudal foot and a 

 row «)t' tubercles ah»n<; each side tVoni which can he protruded curious 

 yellow glands ; when mature they reach al>out three-l'ourths of an 

 inch iu length. These larvie can L>e tuisily seen on the leaves, and 

 ttii; vulnerable at this stage. 



PRKVENTIVE AND IJKMKIH.M. MkasIIIKS. 



All precautions slutuld be taken to destroy as much winter slielter 

 ns ]»ossil)le. After a bad attack it wouhl be advisal)le to burn the 

 mustard straw, not at once, but after it has been allowed to stand 

 some time in heaps iu the fields ; the beetles would seek winter shekel 

 there, and on firing.; the heaps they would l)e destroyed. 



All hed^'e trimmin,i,'s and reedy growths along ilykes should Imj cut 

 and burnt during the winter. 



No exj)erimeuts on a large scale seem to have been made in 

 destroying the larvie up<jn the young plants when it is possible to get 

 on the liind. There is no doubt that the proper time to attack this 

 iHJSt is in it? larval stage when feeding upon the young leaves. 



The fields should then be sprayed by mwins of a hor.se Strawsonizer 

 with Taris-gieen wash ; the time to carry out this oi>eration would 

 dei>end ujM»n the time the grubs are noticed on the leaves. 



The beetles also attack the young leave-s, ami wovild also l)e 

 <lestroyed by the .same wash. The beetles may also be collected, when 

 present in numbers on the young plant, by dragging a long strip of 

 taiTeil .sacking attached to a light rod over the fields, and also by 

 sjx'cial machines. The beetles which attack the cro]) later on in the 

 year may be kept in hand by preventing their movements from place 

 to place. Towards the latter part of the year when so much damage 

 is repjited. the beetles do not seem inclined to use their wings, but 

 mignit4.' in a Ixxly along tiie ground from field to field. They can 

 thus Ihj "held up" like locu.st3 by cutting a trench acmss their line of 

 march, or by burning damp straw so that the 8m«»ke blows on to them. 

 The emplttyment of a shallow tixjnch alM)ut a fo«)i deej) is the l)est 

 jtlan to check them, esi)ecially if it can be tilled or smeared re|>eatedly 

 with tar. 



It is ahso imixatanl to keep hoi-se-luKjing as long as j>ossible 

 between the rows; by this means the pu|xr are turned out of the 

 e;iilh and are exixwed to the attack of various binls, 



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