Insects, etc., Injurious to the Vine. 4.83 



Treatment. 



These large prominent scale insects may be killed by painting or 

 sponging with paraffin emulsion, or may be destroyed by hand, which 

 seems to be the most usual plan. 



Eeferences. 



(1) Newstead, B. ' Monograph of British CoccidiE,' vol. II., p. 51 (1903). 



(2) Fernald, Maria E. 'A Catalogue of the Coccidie of the World,' p. 140 



(1903). 



THE MEALY BUGS. 



{Dad >/I Optus cifri, lUsso, and D. loiujiqjiiius, Targ -Tozz.) 



There are two mealy bugs found on vines under glass and on 

 many other plants in this country, where they do considerable damage. 



The common species, I), 

 ciiri, has also been found out 

 of doors on the ivy-clad walls 

 of a hothouse at Kew and 

 in a few other places, but 

 Newstead tells us he has not 

 known it thrive long in such 

 places. The difference be- 



tween tliese two wlnte mealy 

 Coccids can at once be seen ; 

 citri has short processes, 

 longispinus very long ones. 



They shelter in crevices 

 and under the skin of the 

 vines, where their white '•'^- ' 



n . FIG. 313.— FEMALE MEALY BUG. 



woolly secretions soon cause 



them to be detected. In this country under glass the mealy bugs 



breed all the year round. 



The adult D. citri female is elongated oval and covered with white 

 mealy wax, except at the articulations of the segments, and the waxy 

 marginal appendages are seen to differ from those of D. loiujispinus. 

 The length varies from jV to rather more than J- inch. 



The male is winged and is found in summer in hot weather. The 

 colour is reddish-brown and mealy, the two wings with intense blue 

 iridescence and the abdomen with two long caudal filaments. 



D. citri is a great pest out of doors on oranges in South Europe. 



2 I 2 



