249 
detected on Peaches, Nectarines, Apples, Thorns, 
Laburnums, and numerous other plants. Its ap- 
pearance on the leaves is somewhat like meal or 
flour thinly dusted on, and on the young shoots it 
appears thicker, and more glutinous, but still 
mealy. In respect to its nature there are vari- 
ous opinions ; by some it is considered a species 
of the Fungus, by numerous others it is supposed 
to be caused by insects. 
Robertson (Horticultural Transactions, 
178,) considers that it is a minute Fungus, of 
which different species attack different plants, 
and has found sulphur the only specific cure. 
Kyle (Caledonian Horticultural Transac- 
tions) considers it is caused by an insect ; “ the 
Mildew is occasioned on Peach trees by a very 
destructive insect. I was very much hurt with it 
here, and tried several ways, but could not get 
clear of it till I watered the borders with Cow 
urine, and for nine or ten yeai-s I have not had 
the least appearance of it. I give them a watering 
at the winter dressing, the end of Nov. or in De- 
cember, and then another after they set a growing.” 
Weighton, (Caledonian Horticultural 
Transactions,) after enumerating various dis- 
eases fruit-trees are liable to, says, “ The 
Mildew does much more injury to Peach trees 
than any of the former. It is still uncertiiin 
whether it proceeds from the soil or from the air, or 
whether it be an insect or fungus after some 
other observations, he goes on to state his remedy, 
K 
