132 MANUAL OF TROPICAL AND SUBTROPICAL FRUITS 



color in which the larval and pupal stages are passed." Dino- 

 derus distinctus is a beetle which attacks branches of the 

 mango in India. Sternochetiis gravis is the mango weevil 

 of northern India, similar to the common mango weevil 

 described above. These and many other insects reported as 

 attacking the mango in various parts of the world are described 

 in "A Manual of Dangerous Insects," published by the United 

 States Department of Agriculture (1917). The scale insects 

 are particularly numerous, and cannot be listed here. Several 

 of them are common in the mango orchards of Florida. The 

 genera Aspidiotus, Chionaspis, Coccus, Pulvinaria, and Saissetia 

 are well represented in different parts of the world. Generally 

 speaking, their control by spraying is relatively simple. 



RACES AND VARIETIES 



The classification of mangos must be considered from two 

 distinct standpoints. First, there are numerous seedling 

 races; and second, there are horticultural groups of varieties 

 propagated by grafting or budding. 



The seedling races have not been studied in all parts of the 

 tropics. Most of those in America are now fairly well known, 

 but they are probably few compared to those of the Asiatic 

 tropics. The latter region has not been explored thoroughly. 



So far as known, all the seedling races are poly embryonic. 

 Individuals reproduce the racial characteristics with remarkable 

 constancy. Numerous writers have said that these races (in- 

 correctly termed varieties) come true from seed, and that there 

 is no need of grafting or budding. There is enough variation 

 among the seedlings, however, to make some of them more 

 desirable than others. When one has been propagated by 

 budding or grafting it becomes a true horticultural variety. 



The classification of mangos has been discussed by Burns 

 and Prayag in the Agricultural Journal of India (1915) ; by 



