aD we | 









































_ The effect of the winter on parasites and predators will be interesting to 
_ I find the severa winter has killed many larvae, especially those in or be- 
ath bark as Magdalis or Scolytus." | 
tract from letter of Dr. Hopkins of Feb. 2lseb in answer to 
iat 
Mt "your reference to tho winter-killing of insects is of special interest and 
mu should get as much data as you can on this subject, relating to as many differ- 
it insects as possible. It is of special importance to note what effect it has on 
xtract from letter from Mr. Champlain, of March 15, 1918. 
"Tn regard to winter killed insects, I find that about 50% of the Magdalis 
sroods (HM. olyra) have been killed in the hickory saplings here. 
¢ About the same per cent in infested trees felled last fall and left dying on 
the ground as there were in standing infested trees. The Magdalis seem to go into 
fhe bark more than previous years. About the same per cent of predators (Chari- 
lessa pilosa) in these hickories killed. 
Dead wood borers as Leptura, etc. apparently not harmed. 
Have found some Prionus larvae “n roots that appear to be winter killed. 
: Many twig borers, barkboring Cerambycidae and larvae in stems of weeds, vines, 
pic. winter killed - no percentage on these, 45 the collecting was scattered, 
So far have not found any Agrilus that were killed, all seem to be healthy 
‘put deeper into the wood. 
_ T have no information on Seo.y 
New Haven where I had previously made observations 
fT do not think it is very bad in Connecticut now. 
Tis of any extent is that on Long Island. 
} There is still plenty of time to make observations on winter killed insects 
"as we have kad no spring weather yet, ground frozen, snow and stormy. So I will 
Teontinue to make observations as I find evidence. 
I think the hard winter has killed or injured some of the trees as well 
as the insects, especially some fruit trees, will be able to determine this 
| better - later." 
us as the infestation in this state and at 
seems +o be on the wane. 
The nearest infestation, that 
Hopkins of Mareh 19, 1918, 
"Extract from letter from Dr. 
Mareh 15, 1918. 
Tan answer to Champlain's letter of 
mation relating to the winter-killing 
"T am very glad indeed to get the infor 
et to be studied in con- 
ot insects. This is a very important and interesting subje 
‘nection with the phenological and climatic work." 
"Apparently all the bagworms are killed in the vicinity of Kanawha Station, W. Vaes 
+ observations by Dr. Hopkins - March 23/18. 
third week of March Mr. Kotinsky found Chionaspis euonymi Comst. 
jzabeths Hospital, D. C., showing undoubted evidence 
turned up, not one was found alive. 
1e twigs was also evidently frost 
"on Euonymus bushes at St. @l 
Among hundreds of specimens 
n leaves, though the wood of tt 
| 
Ve 
a In the 
f 
| of winter killing. 
| This was among gree 
j killed. 
\@ Likewise Chionaspis americana Johns. on elm twigs received from Provi- 
Me 7 - 
— eee 
