Kairomonal Battling, sounds like a scene in an epic SciFi movie! But seriously, folks, 

Prey species commonly use predator-released kairomones (PRKs) to detect risk of
predation, yet the chemical identity of PRKs remains elusive. Chemical identification of
PRKs will facilitate the study of predator–prey interactions and the risk of predation, and
when the prey are pests, will potentially provide environmentally friendly means of pest control.

Kairomones are information-carrying chemicals produced
by an individual of one species (the donor) and received by
an individual of a different species (the receiver)

Despite the wide occurrence and importance of kairomones,
the chemical identity of PRKs remains largely
undetermined ... Knowledge of the chemical
identity of these kairomones can provide an important tool
in the study of predator–prey interactions and a better
understanding of the role of kairomones ... 

Moreover, when a PRK repels pest oviposition, it can have 
consequences for pest population size ...
and chemical identification can be used to develop
environmentally friendly means to reduce pest populations.

Silberbush, & al. (2010). Predator‐released hydrocarbons repel oviposition by a mosquito. Ecology letters, 13(9), 1129-1138.

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