Chinese Journal of Entomology (1991) 11, 292-298

H.S. Lo, K.K. Ho and E.L. Hsu (1991)
Effects on mosquito larvae of combinations of Bacillus thurigiensis var. israelensis de Barjac with fertilizers
Chinese Journal of Entomology 11 (4), 292-298
Abstract: Experiments were conducted to determine the effiicacy of Baciillus thuringiensis var. israelensis (B.t.i.) in combination with some fertilizers against mosquito larvae, Culex quinquefasciatus and Cx. tritaeniorhynchus. The results of bioassay show that the effect of fertilizers on Cx. tritaeniorhynchus and Cx. quinquefasciatus is greatest with calcium superphosphate, the LC50 values being 2747ppm and 2193ppm respectively, whereas the effect is least with potassium chloride, on Cx. tritaeniorhynchus and Cx. quinquefasciatus LC50 values being 6195ppm and 9579ppm respectively. Bioassay was performed to determine the effect of various depth of water on the mosquito larvae treated with B.t.i. The results show that the effect on mosquito larvae is greatest with 0.5cm depth, the LC50 values being 0.03ppm, and least with 3.0cm depth, the LC50 values being 0.09ppm. Laboratory bioassay was performed to determine the effect of the combination of B.t.i. with fertilizers on mosquito larvae, the effect of various fertiliaers in combination with B.t.i. on mosquito larvae is greatest with B.t.i. plus second follow-up fertilizers, the LC50 values being 0.03ppm, and least with B.t.i. plus first follow-up, the LC50 values being 0.04ppm. A field model test was performed to determine the effect of the combination of B.t.i. with fertilizers. Larval mortality obtained by B.t.i. plus fertilizers was higher than that with B.t.i. alone. The effect of varous fertilizers in combination with B.t.i. on mosquito larvae is greatest with B.t.i. plus basal fertilizers, the LC50 values being 0.20ppm, and least with B.t.i. second follow-up fertilizer, the LC50 values being 0.28ppm.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Err-Lieh Hsu

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
application technology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Culex quinquefasciatus		Taiwan
	Culex tritaeniorhynchus		Taiwan
Bacillus thuringiensis var. israelensis (entomopathogen)	Culex quinquefasciatus		Taiwan
Bacillus thuringiensis var. israelensis (entomopathogen)	Culex tritaeniorhynchus		Taiwan