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  • Title: Host range and selected factors influencing the mosquito larvicidal activity of the PG-14 isolate of Bacillus thuringiensis var. morrisoni.
    Author: Lacey LA, Lacey CM, Padua LE.
    Journal: J Am Mosq Control Assoc; 1988 Mar; 4(1):39-43. PubMed ID: 3193097.
    Abstract:
    Laboratory bioassay of the PG-14 isolate of Bacillus thuringiensis var. morrisoni (serotype 8a:8b) against early fourth instar larvae of 8 species of mosquitoes revealed a range of susceptibilities similar to the susceptibilities of these species to Bacillus thuringiensis var. israelensis (serotype 14). The most susceptible species were: Culex quinquefasciatus, Cx. salinarius, Anopheles albimanus and Aedes aegypti. The least susceptible species tested was An. quadrimaculatus. Separate bioassays of PG-14 against the four instars of Ae. aegypti demonstrated a strong negative correlation (R = -0.97) between larval age and susceptibility. Temperature significantly affected the stability of larvicidal toxin in aqueous suspensions of PG-14. Larvicidal activity of a bacterial suspension was nearly completely eliminated after 132 days of storage at 31 degrees C, but was essentially unchanged for those suspensions stored at 4 degrees C.
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