pe oe et ‘a 
ene se 
R. C. Hall, Columbus, Ohio, reports that during the past field season 
Se in representative sample plots were selected upon which to carry on a 
study of locust borer larvae survival. A careful. count of young locust 
borer larvae wag made ‘on “these oLlots eariG in ‘the spring. A subsequent 
count of adult emergence wes made.on these. sanie plots ‘this: fall. - These 
two counts made it possible to. determing the pere centage of tarvas surviving. 
Svring and fall diameter mn measurenents were adsc taken on the: above plots. 
About three fourths of nee plots have been completed to date. From an 
analysis of these dat. it‘appears that.a very close relationship exists: be- 
tween diameter increase and survival of locust borer larvze. This relation 
ship is an inverse one with locust borer larvae, survival decreas sing as 
d1a1 
diameter growth increases. Trees with a disneter increz nse cof ‘greater thas 
three tenths inch had practically no survival \ hile “those With an increase 
of less than one tenth inch hada very’ high.survival of larvac, many of 
~ the letterbaving a sirvival nig high as one, Rundréed pepeenty.. ‘These data 
further strengthen ‘the earlier findings that, tree. vivor- and: 6c Si borer 
injury: are very Closely ‘related.. ate A Re, > el aie ae ae 
PaO. W, Collings réports: "During the sumer of 1935 ‘thé' Nélrese: high 
lands, Mass.,.. ‘Laboratory, through the cooperation of the Bureau of iPlont 
Guarantine,..ocbtained gipsy’ meth lurvae’ and pupae from the infestation dis- 
covered at PLtteton; Pa., in 1932. ‘These sample collections were. placed 
in alcohol at thé tine they were made.-anc have siuce hina dissected: — 
parc.pite. recc ds. The results are as follows | 
Locality... |. Nunbbor me Soar * Nutiber |: 
ea dis dissected ‘stage. ‘a parasitized ; 
Jeakins .. ‘23 100'. © $e Pend and avd in-- 5 by wnerieol oo 
, PR star :larvae ae a oe reaseeoue ' 
ereeing . 4, ) 100 * Qndeand 3rd ine 7 2 ets fk ciier ye: 
. | star larvae  .' nelanoscelus: 
i hy “6 Gompeilura . 
concinnata : 
pe SORA <TR Sea a tend (6th el noel ie Mia nas apenteles 
| . " Mirae larvae, .. : mulanoscelus .\ 
Pieinss 6 1004 4th ice Sth in-..  lg-hy J Agartala 
2 Noe Bain, : ‘Star: lar CELE ha RE ag Mel lane sce lus sa § 
ee bi tpt ee DENTS 2 YF ae awe | oo. BB by Sompetlura: 
it ee es orci gm he Nay Aen mie “SN olen cg a | coterana te ae 
Jonkins Wet tatonae fomale. pupae. sa by ' Sturata 
eae seus Liat nha Sf kat 

