PESTS OF THE ORNAMENTAL SHRUBBERY. 



11 



DECIDUOUS-LEAVED SHRUBS 



here enumerated are succeeded by a small subsection, which includes 

 coniferous and allied shrubs, to which, perhaps, should have been added 

 some of those hereafter included with Coniferce, under the " Pests of 

 Forest Trees." 



Berberry White Mould. 

 Ovularia berberidis (Cooke), PI. XVI. fig. 20. 



This mould occurs on the fading leaves of Berberis asiatica, forming 

 greyish-white patches, reminding one of Oidium. The short, slender, 

 unbranched threads are collected in tufts, bearing about their apices the 

 elliptical, uncoloured conidia (15-18 x 8-9 p). 



These moulds are susceptible to the influence of fungicides, should 

 they prove troublesome. 



Sacc. Syll. x. 746 ; Grevillea, xvi. 62, xiii. 98. 



Berberry Anthracnose. 

 Gloeos'porium berberidis (Cooke), PI. XVI. fig. 21. 



This anthracnose on the leaves of Berberis asiatica was first observed 

 in this country in 1884. The spots are on the upper surface, and are 

 broad, somewhat circular, brown, with a reddish margin. -r The pustules 

 are numerous upon the spots, convex, at length splitting at the apex to 

 liberate the conidia, which are ovoid and colourless, comparatively smaH 

 (5x3 fi). 



Sacc. Syll. x. 67 56 ; Grevillea, xiii. 98. 



Purple Berberry Spot. 

 Phyllosticta asiatica (Cooke). 



This spot was found on the leaves of Berberis asiatica about the 

 same time as the anthracnose, which to some extent it resembles exter- 

 nally. The spots are circular or irregular, and pale brown, with a broad 

 purplish margin, which becomes crimson as it passes into the leaf. The 

 receptacles are seated on the upper surface upon the spots, and are very 

 minute and point-like. Sporules very small, hyaline (4 x H /')• 



Sacc. Syll. x. 4865 ; Grevillea, xiii. 91. 



Berberry Leaf Mildew. 

 Microsphcera berberidis (DC), PI. XVI. fig. 22. 



The Berberry Mildew is a common pest of Berberis vulgaris, and 

 partakes of the character of the mildew of the Gooseberry, the Garden 

 Pea, and the Dogwood. The leaves are at first covered with the thin 

 white creeping mycelium, which imparts a chalky appearance, and is then 

 epiphytal ; soon the erect branches become jointed, and the cells become 

 conidia, which fall away successively, arid add to the mealy appearance 

 of the leaves. This stage is the Oidium, but whether it is the Oi d km 



