Comparative Severity Analysis of Asian Soybean Rust in Soybean Farms Sown in December and February in Mato Grosso, 2018/19 Growing Season

Reis, Erlei Melo; Pasquali, Rodrigo Marcelo; Belufi, L. M. de R.; Guerra, Wanderlei Dias; Zanatta, Mateus

doi:10.5539/jas.v12n9p130

Cited by 4 publications

(10 citation statements)

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“…For example, the directional selection pressure is proportional to the spore population. Hence, the fungus is highly prone to mutations in 36 million hectares of annually cultivated soybean than in smaller areas such those conducted on farm trials sown in a period when it does not enter the soybean-free period (Reis et al, 2020).…”

Section: The Sprayed Area Extension and Number Of Sprays On The Directional Selectionmentioning

confidence: 99%

“…Considering that late DSS performed since 2015 receiving up to 10 applications of site-specific fungicides (average of 7.4 according to Reis et al, 2020), should result in greater directional selection of resistant spore population and more likely to survive for the next crop season.…”

Section: Dynamics In the Phakopsora Pachyrhizi Population In The Selection Of Resistant Individualsmentioning

confidence: 99%

“…On the other hand, considering the statistically lower number of applications and greater efficiency of fungicides in FSS we may infer that FSS, may replace the DSS, and with the possibility of selecting mutant populations may be reduced (Reis et al, 2020). There is an economic and environmental gain, because in addition to the smaller number of applications, it results in a population of the fungus with a lower resistance rate than the current situation, which has lasted for five seasons, resulting from DSS.…”

Section: Dynamics In the Phakopsora Pachyrhizi Population In The Selection Of Resistant Individualsmentioning

confidence: 99%

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Directional Selection of Phakopsora pachyrhizi Towards Site-Specific Fungicides in Mato Grosso State

Reis¹,

Zambolin²,

Guerra³

2021

JAS

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This review focus on the sensitivity reduction of Phakopsora pachyrhizi to site specific fungicides in the Brazilian state of Mato Grosso.The soybean grown area in this state in the 2018/19 growing season was 9,756,668 hectares. The main crop disease is Asian soybean rust that depending on disease severity may cause 80% yield reduction. The rust chemical control started in the 2002/003 season with site-specific fungicides applied solo and with 3.6 sprayings/ha/season. For these reasons, the fungus had sensitivity reduction to the fungicides DMIs, QoIs and SDHIs resulting in a short effective life. Anti-resistance strategies were not adopted to prevent or delay the development of soybean rust resistant population to site-specific fungicides. Reduced sensitivity to the target site has been observed for all site-specific fungicides involving cross and multiple resistance resulting in ineffective control. So far, eight mutations in Phakopsora pachyrhizi have been identified conferring reduced sensitivity to DMIs, QoIs and SDHIs but so far specific mutations are not considered in chemical control. The directional selection has occurred and has been aggravated season-after-season by the continuous use of site-specific fungicides in a large area, for 18 season and with more than three sprayings/area/season. The presence of soybean weed in one million hectares of cotton crop infected by rust aggravates the directional selection. Anti-resistance strategies should include sowing at the beginning of the recommended season, avoid the December season and replacing it by February, use of scientific criteria to time the first application and the use of multisite fungicides in all applications and in the entire area cultivated with soybean.

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Section: The Sprayed Area Extension and Number Of Sprays On The Directional Selectionmentioning

confidence: 99%

Section: Dynamics In the Phakopsora Pachyrhizi Population In The Selection Of Resistant Individualsmentioning

confidence: 99%

Section: Dynamics In the Phakopsora Pachyrhizi Population In The Selection Of Resistant Individualsmentioning

confidence: 99%

See 1 more Smart Citation

Directional Selection of Phakopsora pachyrhizi Towards Site-Specific Fungicides in Mato Grosso State

Reis¹,

Zambolin²,

Guerra³

2021

JAS

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“…This may be due to some anatomical or physical character or environmental, in which conditions are not conducive to disease development. Disease escape may be exampled for February sown soybean that faces a less prone environment for infection such those sown mainly in the other months such as December (Reis et al, 2020a(Reis et al, , 2020b.…”

Section: Asian Soybean Rust Escapementioning

confidence: 99%

“…(7) Avoid December sown soybeans with a greater rust severity (Reis et al, 2020a(Reis et al, , 2020b;…”

Section: Final Remarksmentioning

confidence: 99%

An Overview of the Epidemiology of Phakopsora pachyrhizi in the State of Mato Grosso, Brazil

Reis¹,

Guerra²,

Zanatta³

et al. 2021

JAS

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This review seeks to expand the knowledge about the epidemiology of Asian sybean rust in the state of Mato Grosso and contribute to ensuring the economic sustainability of soybean crop. It is discussed the Phakopsora pachyrhizi potential of dispersal from Asia to South America and finally to Mato Grosso state. The origin of the Asian soybean rust inoculum within Mato Grosso is addressed by the survival in volunteer and soybean weed plants (Pitelli, 2015) in other crops such as cotton. Data on the adverse environmental effect on the soybean plants survival are shown mainly the water deficit from June to August. Reports on the effect air temperature and mainly solar radiation on the mortality of airborne spores during their anemophilous spread on sunny days are also discussed. This increase of knowledge aims to make the soybean-free period more efficient by the knowledge on the soybean plants survival and on the fungus viability in the month of August. Due to the proximity of soybean farms, during the soybean-free period, in other states (Tocantins, Goiás, Rondônia, etc.) and in other neighbor countries we discuss the likelihood that inoculum in the state may also originate in out-of-state crops during the Mato Grosso soybean-free period.

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Asian Soybean Rust Severity Sowed in Different Seasons

Reis¹,

Belufi²,

Guerra³

et al. 2020

JAS

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In on-farm trials, the foliolar severity of Asian soybean rust was evaluated in 44 areas, in three regions of Mato Grosso sown in December (2019) and February (2020). Several susceptible cultivars were used in different crop systems; insect pests and weeds were controlled with different management systems by the farmers. Forty soybean leaflets from four plots replications, demarcated at random in each field were taken. In laboratory foliolar severity was appraised. For rust control in the trials conducted in February, fungicides with efficiency greater than 60% were used consisting of DMIs, QoIs and SDHIs in double or triple mixtures, always adding multisites (chlorothalonil, mancozeb, copper oxychloride). The severity was greater in the fields sown in December (4.84% than in February 0.68%). The number of fungicides spraying/ha in December was 6.4 and February 4.6. It is discussed that through the use of multisites fungicides, the mutation potential in Phakopsora pachyrhizi is reduced and that the spores from areas cultivated in February, probably due to unfavorable environment, do not survive during the soybean free-period. Our results indicate that the sowing period can be changed from the end of December to February, since multisites fungicides are always used.

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Comparative Severity Analysis of Asian Soybean Rust in Soybean Farms Sown in December and February in Mato Grosso, 2018/19 Growing Season

Cited by 4 publications

References 1 publication

Directional Selection of Phakopsora pachyrhizi Towards Site-Specific Fungicides in Mato Grosso State

Directional Selection of Phakopsora pachyrhizi Towards Site-Specific Fungicides in Mato Grosso State

An Overview of the Epidemiology of Phakopsora pachyrhizi in the State of Mato Grosso, Brazil

Asian Soybean Rust Severity Sowed in Different Seasons

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