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Stomoxys calcitrans  (stable fly) is a cosmopolitan biting fly of both medical and veterinary importance. Unlike blood-feeding-related behavior of stable fly, its plant feeding, the fitness value, and the  S. calcitrans –plant interaction are less understood. Here we show based on two chloroplast DNA genes, ribulose bisphosphate carboxylase large chain ( rbcL ) and the intergenic spacer gene  trnH-psbA , that field-collected male and female stable flies fed on various plant species. We investigated the fitness cost of plant feeding using  Parthenium hysterophorus , one of the plant species identified to have been fed on by the field-collected flies. Supplementation of blood feeding with a flowering  P. hysterophorus  plant as nectar source enhanced egg hatchability significantly as compared to blood alone, showing the fitness value of nectar supplementation. However, nectar supplementation did not affect the number of eggs laid or longevity of  S. calcitrans  as compared to flies that fed on blood alone.  S. calcitrans  maintained on sugar alone failed to lay eggs. The various plants stable flies fed on demonstrated chemodiversity with their own signature scent. The behavioral response of  S. calcitrans  to these signature compounds varied from strong attraction (γ-terpinene) to neutral (linalool oxide and myrcene) to repellency (butanoic acid). Our study demonstrated that stable flies feed on nectar, and plant nectar supplementation of blood feeding enhanced larval emergence. Thus, our result has implication in stable fly reproduction, survival, disease transmission, boosting laboratory colony, and the possibility of using plant-derived odors for mass trapping of stable fly, for instance, using γ-terpinene.

Supplementing Blood Diet With Plant Nectar Enhances Egg Fertility in Stomoxys calcitrans