Bacillus thuringiensis (Bt) spray products are devoid of protection against undesirable environmental conditions (UV light, heat, dew, phylloplane materials), and are partially effective against bollworm larvae. To improve this situation, we embedded the spore-crystal product in a granular feeding bait formulation. The granules were made of wheat meal used as both a carrier and a feeding stimulant; yeast extract also was incorporated into the granules, to stimulate larval feeding. A combination ofBt subsp.kurstaki andaizawai products was used in the granular formulation, to widen the host-range of the microbe against lepidopteran insects. The most effective size of granules, as studied in a controlled experiment in a dispersion tower, ranged between 149 and 210μ. The granular product dusted on cotton was more active than theBt spray (Dipel) againstEarias insulana. The present paper evaluates otherBt adjuvants and formulations.
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Navon, A., Keren, S., Levski, S. et al. Granular feeding baits based onbacillus thuringiensis products for the control of lepidopterous pests. Phytoparasitica 25, S101–S110 (1997). https://doi.org/10.1007/BF02980337
- Bacillus thuringiensis subsp.kurstaki
- B. thuringiensis subsp.aizawai
- granular feeding bait formulation
- Earias insulana
- Styropor®(polystyrene) feeding choice test
- dispersion tower
- granular size
- feeding stimulants