Predators of mature snails include birds, mice, and again, E. rosea . 

 Two disease-like conditions were described as green body and brown 

 body. Two parasitic flies, Sarcophaga lambens and S. morionel la , were 

 associated with mature snails, as were Hippelates dissidens (Tuck) 

 and megasel ia sp. (Muma, 1955). 



Chemicals . The first study of the effects of chemicals on the 

 citrus tree snail was undertaken by Norris (1946). Zinc sulfate or 

 sulfur was shown safe to snail colonies. Kramer (1952) warns of dusting 

 or spraying snail infested trees with the exception of sulfur. He 

 also states that fertilizer applied to the base of citrus trees during 

 summer months should be avoided because of its toxicity to young snails. 

 The nitrogen portion of chemical fertilizers is toxic to the snail 

 causing immediate withdrawal into the shell and death (Muma, 1955). 

 He indicated that zinc and copper were repellent to the snail because 

 no feeding occurred on leaves dipped in these solutions. Boron and 

 manganese displayed no toxic or repellency effects, while arsenic 

 treated leaves were readily fed on and resulted in death. Muma also 

 recommended sulfur, lime-sulfur, and to a limited extent oil in con- 

 junction with snail culture. 



Food sources . Binney (1878) described the land snail as a phyto- 

 phagous with no mention of any other food source. Algae was reported 

 as a food source by Pilsbry (1946). Sellards (1906) first recorded 

 D. dormani feeding on sooty mold on citrus in Manatee County, Florida. 

 Kramer (1952) stated that the snail consumes neither scales or mites 

 but, due to the deposited slime trail, makes conditions unfavorable to 

 these pests. Large lichens and entomopathogenic fungi on white fly 

 were reported unaffected by the citrus tree snail (Griffiths, 1949). 



