The relationship between agronomic characters of certain soybean varieties and infestation resistance of Etiella zinckenella (Lepidoptera: Pyralidae) under natural conditions
Magda H Naroz, Soheir F Abd El-Rahman and Eman I Abdel-wahab
A field experiment was carried out at Giza Agricultural Experiments and Research Station, Agricultural Research Center, Giza, Egypt during 2017 and 2018 two summer seasons. The experiment included five soybean varieties (Giza 21, Giza 22, Giza 35, Giza 111, Crawford and genotype (Dr-101)) were distributed in randomized complete block design with three replications. Therefore, the objectives of this study evaluate of the commonly grown soybean varieties and genotype (Dr101) in Egypt with respect to their relative susceptibility to infestation with Etiella zinckenella and the relationship between different agronomic characters of the variety and infestation rates and weight seed losses. It was observed that there was a significant difference in natural infestation of soybean varieties by E. zinckenella. The results indicated that soybean varieties Giza35, Crawford and Giza22 had higher susceptibility by the insect infestation than others. Soybean varieties Giza21 and Giza111 were two moderately resistant for pod infestation, while soybean genotype Dr-101 was resistant that recorded the lowest infestation percentage and weight seed losses compared with others. These results reveal that damage of E. zinckenella depended on soybean variety and probably due to plants of soybean genotype Dr-101 had the highest pod pubescence density, and the lowest N content in their leaves, which formed biological barrier for the young larvae of this insect to penetrate soybean pod compared with the others. However, soybean varieties Giza 22 and Giza 111 had higher values of seed yields per plant and per ha than others.
Magda H Naroz, Soheir F Abd El-Rahman and Eman I Abdel-wahab. The relationship between agronomic characters of certain soybean varieties and infestation resistance of Etiella zinckenella (Lepidoptera: Pyralidae) under natural conditions. 2019; 7(2): 69-77.