The effect of Canola planting at the potato fields border on population density of Colorado potato beetle in potato fields in northern Khorasan province and comparison of life table parametres of this pest on nine potato cultivars

Fakhretaha, Zoha Sadat and Fathi, Seyed Ali Asghar and Razmjou, Jebraiel and Alavi, Jalil (2010) The effect of Canola planting at the potato fields border on population density of Colorado potato beetle in potato fields in northern Khorasan province and comparison of life table parametres of this pest on nine potato cultivars. Other thesis, University of Mohaghegh Ardabili.

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Abstract

The Colorado potato beetle, Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae), is an important pest of potato crop, Solanum tuberosum L., in the Ardabil region. In this research, the effect of canola planting (RGsoo3 spring cv.) in margin of potato fields in population density of Colorado potato beetle was studied in the Northern Khorasan. The results indicated that the population density of larvae and feeding stages (larvae+adult) in potato fields with canola planting in the margin of field was significantly decreased than that on potato fields without canola planting in the margin of field. Also in this research, the life table parameters of L. decemlineata raised on seven potato cultivars including Agria, Aozonia, Diamant, Kasmus, Kondor, Moren and Savalan was studied in greenhouse at 25±2oC, 55±5% RH and 14L:10D. In the life table study, the development time of larvae was significantly longest on Savalan and fastest on Agria and Kondor. The survivorship of larvae was lowest on Savalan and highest on Agria and Aozonia among the seven potato cultivars. The oviposition period of females reared on Savalan and Diamant was significantly shorter than those reared on Kondor, Aozonia, Moren, Agria and Kasmus, respectively. The lifetime fecundity was significantly highest on Agria, Kondor and Aozonia and lowest on Savalan and Diamant among the seven potato cultivars. The intrinsic rate of natural increase (rm), net reproductive rate (R0) and generation time (T) was 0.077, 101.95 and 59.57 d on Agria; 0.082, 125.81 and 58.80 d on Aozonia; 0.074, 88.29 and 59.95 d on Diamant; 0.061, 48.26 and 62.87 d on Kasmus; 0.08, 123.48 and 60.01 d on Kondor; 0.065, 64.5 and 63.97 d on Moren and 0.054, 45.19 and 69.36 d on Savalan, respectively. The assaying of mean relative growth rate (MRGR) of newly emerged females of beetle on seven potato cultivars showed that the lowest MRGR was observed on Savalan. Based on these results we conclude that Savalan is the less suitable host plant for L. decemlineata.

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