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Mohammad Jafarlou
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Studying the Efficacy of Fipronil (WG 80%) against Alfalfa Weevil, Hypera postica (Coleoptera: Curculionidae) K. MOHAMMADPOUR 1*, M. JAFARLU 2, H.SOLTANI3 1 Entomology Research Department, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran. 2Agricultural and Natural Resources Research Center of East Azarbayegan Province, Agricultural Research,Education and Extension Organization (AREEO), Tabriz, Iran. 3Agricultural and Natural Resources Research Center of Hamadan Province, Agricultural Research,Education and Extension Organization (AREEO), Hamadan, Iran. * Corresponding author; e-mail: mohammadpour_k@yahoo.com Abstract The Alfalfa Weevil, Hypera postica Gyll. (Coleoptera: Curculionidae), is a key pest of alfalfa in different regions of the world where it causes sometimes complete crop destruction. Application of insecticides is the most important and major control method of this pest. The efficacy of Fipronil (WG 80%) @ 50, 70 and 90 g/ha along with Fozalon (EC 35%) @ 2.5 l/ha and Malathion (EC 57%) @ 3 l/ha were assessed against this pest in the field based on a completely randomized block design. Based on Henderson-Tilton formula, on the fourteenth day after treatment, the minimum efficacy of Fipronil @ 50, 70 and 90 g/ha, Fozalon @ 2.5 l/ha and Malathion @ 3 l/ha bait was 80%, 89%, 98%, 76% and 75%, respectively. Results showed that Fipronil (WG 80%) at 50-70 g/ha can be used against Alfalfa Weevil. Keywords: Alfalfa Weevil, Hypera postica, fipronil, efficacy
Mohammad Jafarlou
added 2 research items
Greenhouse whitefly Trialeurodes vaporariorum (Westwood) is an important pest of greenhouse throughout the world that causes serious damage on agricultural products. Therefore, in this research some biological parameters of pest were studied on four cucumber cultivars (Royal, Soltan, Negin and Vida) on two heights (60 and 90 cm) in greenhouse condition (19-26 °C and 80%±5 RH). Development time of total immature stages was 27.49±0.34, 28.23±0.3, 26.63±0.24 and 27.44±0.3 days, on so-called cultivars respectively while it took a little longer at height 90cm compared to 60cm (28.65 vs. 26.43 days, respectively). The preimaginal mortality percent ranged from 4 to 7% in different treatments although this difference was not significant. Female longevity was 27.9±0.67, 21.35±0.34, 26.71±0.6 and 22±0.46 days on above mentioned cultivars respectively (P<0.01). It was also averaged as 23.29±0.4 and 26.4±0.66 days at the two heights. Number of egg/ female was 203.82±4.89, 132.26±3.57, 210.68±5.31 and 162.79±5.15 on different cultivars with an average of 167.66±5.68 and 187.98±4.75 in 90 and 60 cm (P<0.01). The sex ratio was not significant neither among the cultivars nor between the heights.
The seasonal study of wing dimorphism in the European mole cricket, Gryllotalpa gryllotalpa (Linnaeus, 1758) (Orthoptera: Gryllotalpidae), was carried out in northwest Iran. Based on present research, the long-winged (LW) morph appeared in early-mid spring when vegetation density is low and the crickets need to fly to search for food. Study of foretibiae showed that the dactyls are elongated and longer than shortwinged (SW) morph’s dactyls, and that they are suitable for excavating hard soil in this period. SW adults were observed from May to July and the dactyls are shorter and broader, which are suitable for more tunneling in light soils in the middle of spring.