Abstract
In preliminary laboratory tests, the joint activity of six benzoylphenylureas (BPUs) was studied by investigating the activity of 90 of their binary mixtures against fourth-instar larvae of the cotton leafworm,Spodoptera littoralis (Boisd.), fed for 72 h on 10 ppm BPU-treated castor bean leaves. Experimental mixing ratios were 1:1, 1:4, and 1:9. At 10 ppm, the activity of the six BPUs was divided into two distinct groups. The first included the more active compounds (XRD-473, GR-333, and chlorfluazuron) while the second was composed of the relatively less active ones (diflubenzuron, triflumuron, and Dowco-439). Results of the assays indicated that only 18 of the 90 tested binary mixtures showed potentiation, whereas the majority, 70 mixtures, exhibited additive effects; two interacted antagonistically. Most of the potentiated pairs were at a mixing ratio of 1:9, pairing one strong BPU (at the low ratio) with a weak one (at the high ratio). The mixing ratio of 1:1 resulted in additive effects.
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Radwan, H.S.A., El-Ghar, G.E.S.A. & El-Bermawy, Z.A. Joint action of benzoylphenylureas in binary mixtures against larvae of the cotton leafworm,Spodoptera littoralis . Phytoparasitica 15, 269–276 (1987). https://doi.org/10.1007/BF02979542
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DOI: https://doi.org/10.1007/BF02979542