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Accueil du site → Master → Arabie Saoudite → The impact of intercropping between Hasawi Clover (Medicago sativa L.) and Barley (Hordeum vulgare L.) on the main insect pests and their natural enemies in Hada Al-Sham region

King Abdulaziz University (2020)

The impact of intercropping between Hasawi Clover (Medicago sativa L.) and Barley (Hordeum vulgare L.) on the main insect pests and their natural enemies in Hada Al-Sham region

Alghanmi, Abdullah Talal

Titre : The impact of intercropping between Hasawi Clover (Medicago sativa L.) and Barley (Hordeum vulgare L.) on the main insect pests and their natural enemies in Hada Al-Sham region

Auteur : Alghanmi, Abdullah Talal

Université de soutenance : King Abdulaziz University

Grade : Master Thesis 2020

Résumé
Intercropping or polyculture system refers to the practice of sowing two or more crops in the same field. Intercropping serves as a traditional method of vegetation management in many countries as a sustainable agricultural system, due to its positive impact on yield, improved soil cover and nutrient retention and reduced insect pests and diseases. In this study, one row and two rows of Barley crop Hordeum vulgare L. alternately cultivated with one/two rows of Clover fodder Medicago sativa L. against two controls of Barley and Clover monocultures at the Agriculture Research Station of Faculty of Environmental Sciences, King Abdulaziz University in two seasons (early, late) 2018-2019. Pitfall trapping and sweep net were used for insect’s collection. In addition, the agronomic measurements of Barley crop have been separately achieved at the end of the two seasons. Data were analyzed by applying the one-way ANOVA, repeated measure ANOVA and regressions within SAS version 9.2. Results showed that Barley-Clover intercropping significantly reduced the total pest’s abundances in the late season more than the early season compared with monocultures. The Barley-Clover intercropping systems significantly decreased several species of Grasshoppers such as Morphacris fasciata adult Thunberg, Acrotylus longipes nymph Charpentier and Schistocerca gregaria nymph (Orthoptera : Acrididae), although several insect pests did not response in the same trend to intercropping systems. In addition, the Barley-Clover intercropping systems significantly increased the abundances of several natural enemies such as Nabis americoferus Carayon (Hemiptera : Nabidae), Hyalymenus tarsatus Fabricius (Hemiptera : Alydidae), Coccinella septempunctata L. (Coleoptera : Coccinellidae), ants and spiders (Araneae) in the late season, although the Clover monoculture had more abundant of natural enemies in both seasons. The results also showed that a higher significant difference between the crop treatments over time on several insect pests such as Empoasca fabae Harris (Hemiptera : Cicadellidae), Acheta domesticus L., Gryllus bimaculatus De-Geer (Orthoptera : Gryllidae) and M. fasciata adult Similarly, there was a higher significant difference between the crop treatments over time on several natural enemies such as N. americoferus, Calosoma chlorostictum Dejean (Coleoptera : Carabidae), Wasps and Episyrphus balteatus De-Geer (Diptera : Syrphidae). Data showed a higher significant positive relationship between the total of pests and the total of natural enemies only within the late cropping season. Moreover, regression tests showed that the height of Barley tillers was negatively correlated with the pests of Orthoptera only within the late cropping season in which the height of Barley tillers was negatively correlated with A. domesticus and G. bimaculatus within this cropping season. Overall, understanding predator-prey interactions within intercropping system is required before making any recommendation for applying it as a pest management strategy.

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Page publiée le 14 mars 2022