Sudbury District. This may be the beginning of a new outbreak ^^J^^^J^^o 



this defoliator, which occurs at 10 to l»f-year intervals a<?f%fjf.30nt(5^^o,^^^ 



The last general outbreak of this insect started in 19^8.^,,,^^ _,^^ ».c,t,c.,,p 



The eastern tent caterpillar, which is conspicuous by ttua tent . 



it makes on wild cherry and apple trees along road^sides, showed Increased 



q^.;. t:\^i£.b n^aJ s^v's.ii c:_ ■:::;r]:jf... :,:: .... ,,. : ...^:. .. js:rxvv ^ wan Jer^? woyi 



numbers throi^hout jnost of southern Ontario._,gie ^^^^^J^^^^gg^^rf 

 prevalent in^the |^y Sound District. ^ ^^^^ ^^^^^ ^^^^ ^^^^^ ^^^ ^^ 

 Populations of the black-headed budworm increased in almost all ,. 

 districts, although to date this insect has not shpwn th^ potential fo?^, 



destruction in Ontario that it has on the east and west coasts. „„ 



. ,,.•■.... ... .^clJ^o^> ca.GOHXD Biii 



-X« 9(i.S c^?^® severe infestations of the Jack-plrij bui^worm^c^Jyi^ In ^^^^ 

 the north-central and eastern parts of the Fort Franpes DJstyict, ^.,,,^,+ 



The major tree disease in Ontario is the white-p|ne bXi^ter^fUft^ 



which is well-distributed on white pine over most of the tree's rqinge^ ^ 

 The intensity of the disease varies locally, depending on climate , topo-^ ^^ 

 graphy, and the abundance of the alternate hosts. .,^- r r , ? , . „ 



The Dutch elm disease had a considerable extension in its known 

 distribution, and was found for the first time in Grey, Simcoe, Welling-, ^^ 

 ton, and Renfrew Counties, and the Parry Sound District. 



For the past two years considerable attention has Been given to 



the deterioration or dieback of sugar maple in woodlots in the Lake Huron 



District. The survey of sugar maple deterioration conducted last year 



revealed that, in addition to maple, almost all hardwood species are 



■ s^oi 

 suffering some degree of dieback. It is encouraging that the latest 



check on the condition of the trees under observation indicates that the 



• ■ ,■.,:.- x... a V 

 maple and other hardwoods are showing slight improvement. 



■ 'riijo edi 

 Control Most operations in the direct control of insect infestation 



have been conducted in the pine, spruce, and larch plantations of southern 



