caa a22 4500 386375771 CHVBK 20180307112017.0 cr unu---uuuuu 161130e198906 xx s 000 0 eng 10.1017/S1742758400003593 doi S1742758400003593 pii (NATIONALLICENCE)cambridge-10.1017/S1742758400003593 Studies on the residual activity of three synthetic pyrethroids cypermethrin, fenvalerate and permethrin against cotton stainers, Dysdercus spp (Hemiptera: pyrrhocoridae) [Elektronische Daten] Studies conducted using laboratory and field bioassays showed that cypermethrin (b = −1.691) had a significantly (P < 0.05) higher and longer residual action at 7,14,21 and 28 days after application than did fenvalerate (b = −2.28) and permethrin (b = −1.871) against Dysdercus fasciatus Sign, and D. nigrofasciatus Stal. when coefficient regression analyses were performed. Residual action of fenvalerate and permethrin was regarded as being identical over the same experimental period in the field since their regression coefficients were not significantly (P > 0.05) different from each other. It was also shown by these studies that the effective interval between applications was 21 days for cypermethrin and 14 days when fenvalerate and permethrin were applied. This finding has important practical implications in the adoption of an integrated approach aimed at minimizing damage to cotton by D. nigrofasciatus. Copyright © ICIPE 1989 Bioassays nationallicence cypermethrin nationallicence fenvalerate nationallicence permethrin nationallicence residual action nationallicence Dysdercus spp nationallicence effective application interval nationallicence Bio-essai cypermethrine nationallicence fenvalerate nationallicence permethrine nationallicence action résduel nationallicence Dysdercus spp nationallicence période intervalle nationallicence Khaemba Battan M. Department of Zoology, Moi University, P.O. Box 3900, Eldoret, Kenya Mambiri Aggrey M. Kibos Cotton Station, P.O. Box 1490, Kisumu, Kenya International Journal of Tropical Insect Science Cambridge University Press 10/3(1989-06), 347-352 1742-7584 10:3<347 1989 10 JTI https://doi.org/10.1017/S1742758400003593 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1742758400003593 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Khaemba Battan M. Department of Zoology, Moi University, P.O. Box 3900, Eldoret, Kenya NATIONALLICENCE 700 1- Mambiri Aggrey M. Kibos Cotton Station, P.O. Box 1490, Kisumu, Kenya NATIONALLICENCE 773 0- International Journal of Tropical Insect Science Cambridge University Press 10/3(1989-06), 347-352 1742-7584 10:3<347 1989 10 JTI CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge