Development of Gibberella Ear Rot on Processing Sweet Corn Hybrids Over an Extended Period of Harvest

Abstract

Gibberella ear rot, caused by Gibberella zeae, has increased in prevalence recently on lateseason processing sweet corn grown in North America. Little information is available about the development of Gibberella ear rot on processing sweet corn hybrids over extended periods of harvest. In five trials from 2003 to 2005, 12 processing sweet corn hybrids were inoculated with G. zeae and evaluated for severity of Gibberella ear rot on sequential harvest dates from 19 to 27 days after midsilk. Ear rot severity was assessed using a rating scale based on the percentage of kernels with visible symptoms of G. zeae colonization including kernel rot and mycelial growth. Severity ranged from 1.6 to 47.8% over the five trials. None of the hybrids was highly resistant to Gibberella ear rot, although some appeared to be less susceptible. Gibberella ear rot was less severe on three hybrids (GH 2690, GG 147, and Sprint) and more severe on three hybrids (GG 42, GG 145, and Jubilee). Other hybrids had moderate levels of ear rot or responses that varied among years. The relative response of hybrids did not change substantially during the extended period of harvest; however, the rate at which Gibberella ear rot developed on hybrids differed in 2003 and 2005 as reflected by a significant hybrid by harvest interaction. The interaction was primarily the result of Gibberella ear rot developing more severely on susceptible hybrids than on the less susceptible hybrids. The difference in Gibberella development could be exploited to limit losses due to this disease under certain circumstances. If a sweet corn processor had several fields ready to harvest at the same time, and some fields were planted with hybrids that are more susceptible while other fields were planted with hybrids that are less susceptible, losses due to Gibberella ear rot might be minimized by harvesting the most susceptible hybrids first. Other hybrids that might be best suited for early or late harvest can be identified from Gibberella ear rot ratings 28 days after silk channel inoculation at the midsilk growth stage.

Response of oat morphologies, root exudates, and rhizosphere fungal communities to amendments in a saline-alkaline environment

“…This is due to the decrease in soluble sugar and organic acids in the rhizosphere of Caoyou1 caused by the rotten straw application. Fungal genera Gibberella, Fusarium, and Bipolaris, can be harbored in soils [59] and are common pathogens that lead to crop yield loss [52,60,61]. The amendments containing rotten straw significantly decreased R. arrhizus for the sensitive cultivar Caoyou1, but not for the tolerant cultivar Baiyan2.…”

Characterization and variation of the rhizosphere fungal community structure of cultivated tetraploid cotton

“…BSL-10 [77]. Most of reports about Gibberella , Verticillium were the pathogenicity to plants, such as Gibberella zeae [78], Verticillium dahliae [31]. In NS, Gibberella and Verticillium was inhibited in seedling and budding stage but promoted in rhizosphere of Hai 7124 in flowering stage, suggesting the inhabitation of cotton were decreased in flowering stage.…”

Uji Keefektifan Formulasi Bacillus subtilis untuk Mengendalikan Penyakit Busuk Batang Fusarium pada Tanaman Jagung In Vivo

“…Berdasarkan hal tersebut dilakukan penelitian yang bertujuan untuk mengetahui efikasi formulasi B. subtilis koleksi Balai Penelitian Tanaman Serealia (Balitsereal) terhadap penyakit busuk batang Fusarium di laboratorium dan rumah kaca. (Nordby et al 2007). Di rumah kaca dilakukan pengujian dengan 10 perlakuan, masing-masing delapan formulasi B. subtilis (BS TLB1; BS BJ6; BS TM3; BS TM4; BS BNt4; BS BNt6; BS BNt8, kontrol pembanding dengan fungisida sintetik, dan kontrol positif (inokulasi F. verticillioides).…”