October, ’20] 
WELLHOUSE: HAWTHORNE INSECTS 
389 
Among the more important of the species which are now only Cra¬ 
taegus or hawthorn pests but which we may probably expect on our 
cultivated fruits later are the following: 
The hawthorn blossom weevil, Anthonomus nebulosus Lee. Its 
life history and habits are identical with those of the apple blossom 
weevil of Europe which, according to Theobald, sometimes destroys 
40 per cent of the apple crop in England. As yet our species attacks 
only Crataegus but its habit of attacking the fruit buds would make it 
a very dangerous pest if it should attack the apple. 
The hawthorn fruit miner, Blastodacna curvilineella Chamb. The 
larvae of this little Cosmopterygid are among the most common causes 
of “wormy” haws in Central New York and they probably are dis¬ 
tributed at least over the eastern states. The larvae have the habit of 
leaving the fruit in early autumn and burrowing into a dead twig or 
weed stem to spend the winter. They have undoubtedly been long 
overlooked because they are very active and work their way through 
the breeding cages to escape even through several layers of fine meshed 
cheese cloth. 
A new leaf bug, Lygus univittatus Knight, resembling the false 
tarnished plant bug in appearance, has been found by the writer punc¬ 
turing the fruits of Crataegus at Ithaca and Knight believes this will 
eventually become an apple pest. Its punctures do not deform the 
haws to any extent but may affect the apple differently. 
A number of leaf-hoppers, the most numerous of which are Empoa 
querci , Lamenia vulgaris , Erythroneura obliqua, and Idiocerus provan- 
cheri, cause considerable damage to the Crataegus foliage. 
The four-spotted hawthorn aphid, Macrosiphum cratcegi Monell, 
remains all summer on hawthorn and has caused much damage to the 
trees even during warm dry weather. It is easily distinguished from 
our common hawthorn and apple aphids by the four conspicuous dark 
green spots arranged in a rectangle on the backs of the apterous 
females. 
Argyresthia oreasella Clem. A little white and gold bud moth which 
in the larval stage bores into the terminal buds causing them to wilt 
and die in May. The blackened terminals are occasionally very nu¬ 
merous on hawthorns about Ithaca. 
Over 100 species of insects which feed on apple also feed on haw¬ 
thorns. Among them are the following common apple pests: 
False tarnished plant bug, Lygus communis 
Apple aphids (Aphis avence, A. pomi, A. sorbi, Eriosoma lanigera) 
Scale insects (Aspidiotus perniciosus, Chiunaspis furfura, Lepidosaphes ulmi, 
Lecanium corni, etc.) 
Flea beetles (Haltica foliacea Lee., Crepidodera helxines Linn., etc.) 
