The Larval-Pupal Parasitoid, Enicospilus repentinus (Hol.) and Resistant Varieties as Bio-Agents for Regulating Populations of Scrobipalpa ocellatella Boyd. in the Egyptian Sugar Beet Fields

Document Type : Original Article

Authors

1 Plant Protection Department, Faculty of Agriculture, Tanta University, Egypt

2 Economic Entomology& Agricultural Zoology Dept., Faculty of Agriculture, Menoufia University, Egypt.

Abstract

Sugar beet is widely grown across the world as a source of sucrose. Like all crops, sugar beet suffers threats to achieving maximum yield due to a range of pests and careful management of these threats is required to limit yield loss. One pest which poses a threat to sugar beet crops all over the world Scrobipalpa ocellatella Boyd. Currently, insect pest control in sugar beet fields depends on integrated pest management (IPM) programs to avoid using insecticides. IPM of sugar beet insect pests could be achieved through applying combinations of practices such as parasitoids and resistant varieties. Thus, the present paper was carried out at the Experimental Farm of Sakha Agricultural Research Station, Kafr El-Sheikh Governorate Egypt in 2019/ 20 and 2020/21 seasons.
             Findings have succeeded to recorded the larval-pupal parasitoid, Enicospilus repentinus (Hymenoptera: Ichneumonidae) on Scrobipalpa ocellatella Boyd. for the first time in Egyptian sugar beet fields. Seasonal parasitism was 48.83, 50.87 and 62.76% to the three cultivations, respectively in season 2019/20. As, 42.85, 41.50 and 48.45% to the three cultivations, respectively in season 2020/21. Alauda, Maimound and Clgogne varieties are resistant to S. ocellatella whereas, Bts 3980, Bts 8115 and Nefirlitis are susceptible. Consequently, E. repentinus parasitoid and resistant varieties may be used in IPM program against S. ocellatella under the Egyptian sugar beet conditions.

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