The khapra beetle, Trogoderma granarium Everts (Coleoptera: Dermestidae), is a polyphagous pest that infests many stored grains and products. The effect of nine maize hybrids including 704, AR 89, AS 71, AS 77, BC 678, KSC 703, PL 472, SC 704, and Simax was studied on biology and life table parameters of T. granarium at controlled conditions (33 ± 1 °C, 65 ± 5% RH, and a photoperiod of 14:10 [L:D] h). According to the results of this study, the immature period was the longest on BC 678 (56.79 ± SE: 1.51 d) and the shortest on PL 472 (39.90 ± 0.48 d). The highest values of fecundity and fertility were observed on PL 472 (67.95 ± 1.23 eggs and 74.81 ± 0.68%, respectively) and the lowest values were on BC 678 (40.00 ± 1.63 and 48.24 ± 1.35, respectively). The net reproductive rate (R0) of T. granarium ranged from 10.40 ± 0.11 offsprings on BC 678 to 30.43 ± 0.20 offsprings on KSC 703. The highest intrinsic rate of increase (rm) was for T. granarium reared on KSC 703 (0.0773 ± 0.0001 d-1), and the lowest was on BC 678 (0.0390 ± 0.0002 d-1). According to the obtained results, BC 678 is an unfavorable hybrid for population increase of T. granarium, which can be recommended to be grown in regions where the damage of T. granarium is considerable to minimize maize infestations by this pest.
The rice weevil, Sitophilus oryzae L. (Coleoptera: Curculionidae), is one of the most destructive pests of stored cereal grains globally. In this study, we evaluated the grain resistance of different rice cultivars (Anam, Gilar, Hashemi, Keshvari, Rash, and Tisa) and lines (8608, MN-7, TH-1, and TH-2) using life history and life table parameters of S. oryzae under laboratory conditions (28 ± 1°C, 70 ± 5% relative humidity, and complete darkness). The immature survival of S. oryzae decreased significantly when it was reared on Rash. Among tested grains, developmental time was the longest on Rash and the shortest on Hashemi. Compared with the other cultivars and lines, the fecundity (number of eggs laid) was significantly lowest on Rash. The highest intrinsic rate of increase (rm) was recorded in S. oryzae reared on Hashemi and the lowest was on Rash. The grain weight loss (%) was the highest when S. oryzae was fed on Anam and TH-1, and lowest when it was reared on Rash. Significant negative correlations were recorded between the starch, protein and total phenolics content of tested grains and fecundity, rm, net reproductive rate (R0), and finite rate of increase (λ) of S. oryzae. The present research revealed that Rash cultivar was more unsuitable to S. oryzae than the other cultivars and lines because of slow developmental time, poor fecundity, low grain weight loss and low rm value on this cultivar. Our results could help to select resistant rice cultivars to S. oryzae for production of transgenic grains.
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