The investigation of resistance of some canola cultivars to diamondback moth, Plutella xylostella (L.) under the field and greenhouse conditions in Ardabil region

مريم, بزرگ اميرکلائی and دکتر سيد علي اصغر, فتحي and دکتر قدير, نوری قنبلانی and دکتر هوشنگ, رفيعی دستجردی (2009) The investigation of resistance of some canola cultivars to diamondback moth, Plutella xylostella (L.) under the field and greenhouse conditions in Ardabil region. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

The diamondback moth (DBM), Plutella xylostella (L.) (Lepidoptera: Plutellidae), is an important pest of canola crop, Brassica napus L., in the Ardabil region. In this research, the resistance of 19 canola cultivars to P. xylostella was studied in the three following experiments: (1) field screening, (2) oviposition preference and (3) life table study. The results of the field screening indicated that the number of moth larvae and pupae was lower on Elite, Option500, Ebonite, Hyola401, Opera, Okapi, Adder and RGsoo3 respectively, among the 19 canola cultivars. The oviposition preference and the life table parameters of P. xylostella reared on nine canola cultivars including Zarfam (as control), Ebonite, Elite, Adder, Okapi, RGsoo3, Hyola401, Option500 and Opera (as treatmeants) was studied in greenhouse at 25±5oC, 55±5% RH and 14L:10D. In oviposition preference by females, the number of oviposited eggs per plant on canola cultivars decreased in the following order: Zarfam (44.7), RGsoo3 (35.9), Adder (35.1), Okapi (31.1), Elite (29.8), Opera (29.4), Hyola401 (27.2), Option500 (25.1) and Ebonite (23.5) respectively. In the life table study, the lifetime of female and male on Opera, and Hyola401 was significantly longer than that on Zarfam and Adder. The lifetime fecundity was significantly highest on Adder and lowest on Opera among the nine canola cultivars. The egg-to-adult survival was lowest on Opera, Option500 and Hyola401 and highest on Zarfam among the nine canola cultivars. The intrinsic rate of natural increase (rm), net reproductive rate (R0) and generation time (T) was 0.23, 52.26 and 17.23d on Zarfam; 0.214, 49.35 and 18.22d on Ebonite; 0.207, 44.05 and 18.26d on RGsoo3; 0.193, 34.36 and 18.29d on Okapi; 0.212, 45.54 and 18.04 on Adder; 0.195, 38.22 and 18.71 on Elite; 0.178; 31.41 and 19.41d on Opera, 0.187, 33.46 and 18.72d on Option500 and 0.183, 39.06 and 19.97d on Hyola401 respectively. Based on the population growth parameters, we concluded that Zarfam is the most suitable and Opera is the less suitable host plant for P. xylostella.

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