STRAWBERRY ROOTWORM ON GREENHOUSE ROSES 5 
| Va., on July 25 revealed the seriousness of the injury and the reason 
_ ticular season, owing to 
| the fact that the roses were 
_ showed that the larve had 
roots (fig. 2) earlier in the 
these injuries a gradual 
_ the possible origin of the 
for the appeal for assistance. The stock in eight large houses suf- 
fered infestation, five, of the open-range type, being extremely heavily 
infested. The,damage was caused mainly by the adults, which were 
present in unusually large numbers. As a result of their voracious 
feeding practically all of the foliage was badly perforated and 
ragged (fig. 1). In addition, a large proportion of the young shoots 
“| had the wood badly scarred and girdled, giving it a very unsightly 
appearance. It was found that the adults had a marked preference 
for this new wood, of which there was an abundance at this par- 
being forced vigorously. 
Further examination 
also been feeding on the 
season. As a result of 
killing of the affected parts 
ensued, producing a stunt- 
ed growth of the plants. 
In attempting to establish 
infestation in Alexandria, 
records by A. D. Borden 
showed that this insect had 
been attacking roses in the 
same houses three years 
previously. Recent  evi- 
dence disclosed that the 
soil in which the roses 
were growing had been in 
the benches since -then; 
hence it seems that their 
occurence dated back to 
that time. , 
Judging from the report 
made by H. F. Deitz, the 
Indiana infestation obvi- me. 2—Roots of rose plant devoid of rootlets and 
ously was not so severe as severely injured by larve of the strawberry 
the one at Alexandria. It “~~? ™ 
was learned from the florist, however, that serious injury had occurred 
during May, the injuries being confined to Killarney rose plants | 
| growing in a solid bed in one of the five open-range houses infested. 
The condition there was similar to that existing at Alexandria, since 
the plants had been forced for about three weeks and had put forth 
an abundance of young, tender shoots. In the same locality Dietz 
noted this insect feeding on the foliage of out-of-door roses “ grow- 
ing next to a large strawberry bed, the leaves of which were badly 
riddled by the beetles.” 
Karly in November, 1919, specimens of the strawberry rootworm 
were collected in the rose houses of the United States Botanical 
Garden at Washington, D. C., where they were doing serious injury. 
