310 



STATE HORTICULTURAL SOCIETY. 



from them that the plums shrivel and drop off for the lack of nourishment. 

 The treatment is the same for the plum aphis as for the other aphidsB — 

 kerosene emulsion. 



; i Fig. 26. — Papa of Anatis 15-punctata attached 

 to a plam. 



Fig. 27,— Imago of Anatis 

 15-punctata. 



Where the aphis has been common on the plum trees, people often find 

 plums with an insect on them resembling Fig. 26 and think it a new pest 

 which has appeared for ttiem to fight. The insect attached to the plum is 

 the pupa of the little lady-bird beetle Anatis 15-punctaia Oliv. This lit- 

 tle lady-bird and the larva from which the pupa came, are insects that feed 

 almost exclusively on plant lice and never injure fruit of any kind. They 

 are friends, as they help rid the trees of the lice, and should never be killed 

 if it can be avoided. 



FUNGOUS DISEASES OF THE QUINCE. 



While this fruit is attacked in all its parts by fungi, as a rule the diseases 

 have not been very destructive in Michigan and most of them yield readily 

 to fungicides and other treatment. 



TWIG Bl^IGHT (Bacillus amyUrvorus, Barr.). 



This disease, which is similar in its nature to the fire blight of the pear, 

 has in some localities made inroads into the quince orchards. As a rule, 

 it is confined to one or more of the branches, but in severe cases it spreads 

 through the trees. It can readily be distinguished from the leaf blight, as 

 it causes the leaves to turn an even brown color and there is no appear- 

 ance of spots as in that disease. The leaves also remain upon the twigs, 

 which become dry and hard. While Bordeaux mixture will aid in keeping 

 down the disease, it will not entirely prevent it, and the only remedy is to 

 cut out and burn the diseased branches, making the cut several inches 

 below where any sign of disease shows. 



LEAF BLIGHT AND FRUIT-SPOT ( E/itowosporiuw maculatum, Lev.). 



Of the other diseases of the quince none is more prevalent than the above, 

 which is of a fungous nature and appears upon the pear in the same forms. 



