66 
many hundred acres of melons. The underspraying with a 12 to 15 per 
cent solution of kerosene and water has been found to be the most sat- 
isfactory remedy. 
The strawberry root-louse, Aphis forbesi, has been very destructive 
to many young beds in Caroline, Dorchester, and Somerset counties. 
No satisfactory remedy has been discovered. 
The black peach aphis, Aphis prunicola, so very abundant and injuri- 
ous last year, has been found in only a few isolated places this season. 
The striped cucumber beetle, Diabroticu vittata, has kept up its repu- 
tation as a destructive species during the season. It has been reported 
upon cantaloupe and watermelon especially. 
Of the scale insects, the San Jose scale, Aspidiotus perniciosus, has 
been the most conspicuous one in our state work. We have located, 
by inspection and report, fifty-three new localities during the past year. 
In every instance the badly infested trees of no commercial value have 
been cut down, while others, slightly infested, have been sprayed with 
20 to 30 per cent kerosene or fumigated with hydrocyanic acid gas. 
On peach and plum we use 20 per cent kerosene and water as a sum- 
mer treatment, while on apple and. pear we use 30 per cent. We so 
reduced the San Jose scale that we no longer fear its further spread. 
By eternal vigilance we expect to keep our large commercial orchards 
free from it. 
We thought at one time that the severe weather of last winter had 
been very destructive to the scale in many places in the State; but we 
could find very few dead scales, normally protected, even upon infested 
trees this spring, when the temperature ranged last February from 22° 
to 26° below zero. IJ believe the San Jose scale can adapt itself to 
any climate where the deciduous fruits thrive. 
I have just received (August 7) a letter from George E. Fisher, a gen- 
eral inspector for the Canadian government, in which he states that he 
has just examined an infested orchard where the temperature was from 
2° to 22° below zero last January for two weeks, and went below 22° 
again in February, and that he finds the scale breeding abundantly. 
He further states that he believes the scale will withstand a much lower 
temperature than is generally believed. 
Theterrapin scale, Lecanium nigrofusciatum, has been found in a num- 
ber of instances hore it was doing injury to plum and peach. I have 
never seen a tree killed by this scale, but the fruit from infested trees 
is small, insipid, and usually covered with honeydew and a blackish 
fungous growth, making it worthless. Spraying with a 15 to 20 per cent 
solution of kerosene and water has proven a successful remedy. 
The oyster-shell scale, Mytilaspis pomorum, has been very destructive 
to lilac, and has been reported from seven places this season. This spe- 
cies is double-brooded in Maryland. The over-wintered eggs hatch 
about the first week in May, and the young of the second brood appear 
the last week in July or the first week in August. This is also true of 
