Diversity of Phytophthora Stem Blight of Pigeonpea and Its Sustainable Management

Naik, S. J. Satheesh; Basavaraja, T.; Mishra, Raj Kumar; Padmaja, G.; Poornima, K. N.

doi:10.1007/978-3-030-35947-8_7

Cited by 1 publication

(1 citation statement)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Andrieu et al [22] reported that famoxadone inhibited the growth of P. infestans during the different stages of its life cycle by causing lysis of sporangia and zoospores at the time of release and differentiation. Similar systematic studies on the efficacy of fungicides on P. cajani are limited, and very few studies have been reported on the effectiveness of fungicides in managing the Phytophthora blight in pigeonpea [23][24][25]. To the best of our knowledge, none of the studies has reported the efficacy of fungicides in the inhibition of sporangia and zoospore formation, discharge of zoospores, or infection in pigeonpea seedlings.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Fungicides and Fungicide Application Methods to Manage Phytophthora Blight of Pigeonpea

2023

View full text Add to dashboard Cite

Phytophthora, a blight of pigeonpea caused by Phytophthora cajani, has been significantly increasing in major pigeonpea production regions of India. Limited information on infection with this pathogen and its epidemiology, as well as a lack of adequate resistant cultivars, is hampering the management of Phytophthora blight significantly. Therefore, five fungicides, viz., metiram + dimethomorph, cymoxanil + mancozeb, famoxadone + cymoxanil, mancozeb, and metalaxyl-M + mancozeb, were evaluated against P. cajani under control conditions to control zoospore induction, as well as the infection of zoospores, at the seedling stage. The half-maximal effective concentration (EC50) of fungicides for mycelial inhibition was calculated. The lowest EC50 was recorded in metiram + dimethomorph (0.17 µg/mL), followed by the metalaxyl-M + mancozeb (2.49 µg/mL) and cymoxanil + mancozeb (8.23 µg/mL) fungicides. The formation of the sporangium and zoospores was most significantly affected by metalaxyl-M + mancozeb, followed by metiram + dimethomorph and cymoxanil + mancozeb, in terms of sporangia viability and zoospore germination and encystment. Further, under glasshouse conditions, different fungicide application methods (e.g., seed-treatment; soil-drench; foliar-spray, either singly or in combinations) were evaluated with fungicides on susceptible (ICP 7119) moderately resistant pigeonpea (ICPL 99010, ICPL 20135 and ICPL 99048) cultivars. The seed-treatment + soil-drench, soil-drench + foliar-spray, and soil-drench of fungicide application methods were found to be effective in controlling the Phytophthora blight, at p < 0.001. A combination of the seed-treatment + soil-drench and soil-drench + foliar-spray methods, using metalaxyl-M + mancozeb or metiram + dimethomorph fungicides on moderately resistant cultivars (ICPL 99010), has a synergistic effect on the ability to control the Phytophthora blight at the seedling stage.

show abstract