Impact of aphid infestations and yellow rust infection on some wheat cultivars Egypt

Abstract EN

This study was carried out to evaluate the susceptibility of six wheat varieties, sids 12, gemmeiza 11, misr 1, misr 2, sakha 94 and giza 171 to infestation with cereal aphids especially the oat bird-cherry aphid, Rhopalosiphum padi L., the greenbug aphid, Schizaphis graminum (Rondani) and the English grain aphid, Sitobion avenae Fabricius (Hemiptera: Aphididae) and the yellow rust disease in grain yield under field conditions at Sakha Agricultural Research Station, Kafr El-Sheikh, Egypt during two growing seasons and successive seasons 2017/2018 and 2018 / 2019.

Data showed that the presence of aphids on six varieties was highly concentrated during the period was extended from the first week of January till the end of March during both tested seasons.

The highest value was 69.8, 61.9, 73.1 and 30 individuals/ 10 plants on misr 1, sids 12, misr 2 and sakha 94 at 2nd week of March.

While, it was reported at the first week of March by 69.7 and 51.8 individuals/ 10 plants on gemmeiza 11 and giza 171, respectively.

A significant difference was reported between the tested wheat cultivars.

The field experiment with nirtire of races yellow rust of Pucciniastrii formis f.

sp.

tritici physiologic races as a source of inoculam.

Yellow rust infection significantly reduced grain yield of all inoculated cultivars as compared to the protected ones Disease severity was recorded weekly, and area under disease progress curve was estimated and ranged from 41,30 to 558.00 in wheat cultivars Sakha 94 and Sids 12 during season 2017/18 while, 60.00 to 925.00 in wheat cultivars Giza 171 and Sids 12 during season 2018/19.

The loss in 1000 kernel weight of the different wheat cultivars was variable according to the varietal response.

The 1000 kernel weight of the protected plants of all wheat cultivars were higher than the infected treatment and also significant differents were found between infected and protected wheat cultivars under the study.

according yield losses ranged from 10.54 to 30.73 in wheat cultivars sakha 94 and Sids 12 during season 2017/18 7.53, 73.44 wheat cultivars giza 171 and sids 12 during season 2018/19.