Evaluation of pyrimethanil (Scala) for the control of Botrytis cinerea on harvested Geraldton waxflower

1999 ◽  
Vol 39 (5) ◽  
pp. 639 ◽  
Author(s):  
M. N. Taylor ◽  
A. H. Wearing ◽  
D. C. Joyce ◽  
D. H. Simons

Pyrimethanil (Scala) is a fungicide that might be used for control of Botrytis cinerea infecting Geraldton waxflower. New treatments are sought to reduce the risk of developing strains of B. cinerea that are resistant to fungicides commonly used against it, such as benomyl (Benlate) or iprodione (Rovral). Scala was applied to waxflower as a postharvest dip at 1.5 or 2 mL product/L. Disease severity on and flower and leaf drop from waxflower bunches pre-inoculated with B. cinerea were significantly (P = 0.05) reduced by treatment with Scala. Further, flower and foliage vase lives were significantly (P = 0.05) longer as a result of postharvest treatment with Scala as compared with water-treated (control) stems. Similar degrees of disease control where achieved with either Scala or Rovral. The results demonstrate that Scala has real potential as an alternative fungicide for control of B. cinerea on waxflower.

Plant Disease ◽  
2006 ◽  
Vol 90 (3) ◽  
pp. 358-364 ◽  
Author(s):  
P. M. Rogers ◽  
W. R. Stevenson

Foliar diseases of carrot caused by Alternaria dauci and Cercospora carotae occur every year in Wisconsin, requiring repeated foliar fungicide applications to minimize defoliation and yield reduction. Improved timing of fungicide applications combined with the use of disease resistant cultivars offer growers a means to improve disease control with fewer fungicide inputs compared with the current strategy of weekly fungicide applications to a susceptible cultivar. Field experiments in 2002 to 2004 examined fungicide application schedules indicated by a disease forecasting model that calculated the duration of environmental conditions favorable for A. dauci and C. carotae (adaptation of TOM-CAST) on two carrot cultivars differing in susceptibility to these foliar diseases. All fungicide programs were initiated at a 1% disease severity threshold determined by scouting. Intervals for weather-based spray programs were based on in-canopy leaf wetness and temperature data. Fungicide sprays were applied according to 15 and 20 disease severity value (DSV) application thresholds, and were compared with a weekly spray program and an untreated control. Results of this trial demonstrated that fungicide sprays made according to weather data may reduce fungicide inputs in most years compared with current industry-standard, calendar-based spray programs. Host susceptibility affected the efficacy of weather-based spray programs, resulting in longer spray intervals and fewer fungicide applications on the resistant cultivar Bolero when compared with the susceptible cultivar Fontana. Fungicide spray programs based on TOM-CAST diminished fungicide inputs by 30 to 50%, compared with the weekly spray program, by lengthening intervals between applications without compromising disease control or root yield.


Irriga ◽  
2006 ◽  
Vol 11 (3) ◽  
pp. 328-338
Author(s):  
Ieoschua Katz ◽  
Antonio Ribeiro da Cunha ◽  
Antonio De Pádua Sousa ◽  
Egberto Egon de Herdani

COMPARAÇÃO DE DOIS MÉTODOS DE APLICAÇÃO DE FUNGICIDAS,IRRIGAÇÃO POR GOTEJAMENTO  E PULVERIZAÇÃO CONVENCIONAL    NO CONTROLE DO MOFO CINZENTO (Botrytis cinerea Pers.: Fr.) EM VASOS COM PLANTAS DE LISIANTHUS (Eustoma grandiflorum (Raf.) Shinn.)  Ieoschua Katz1; Antonio Ribeiro da Cunha2; Antônio de Pádua Sousa1; Egberto Egon de Herdani11Departamento de Engenharia Rural, Faculdade de Ciëncias Agronömicas, Universidade Estadual Paulista, Botucatu, SP, [email protected] Departamento de Recursos Naturais, , Faculdade de Ciëncias Agronömicas, Universidade Estadual Paulista, Botucatu, SP  1 RESUMO Novas técnicas de combate às doenças têm sido usadas, como os defensivos hidrossolúveis via água de irrigação, a quimigação, um procedimento recente que reduz a mão de obra, com uniformidade na aplicação, menor contato do operador com produtos tóxicos, e menores impacto ambiental e custo de produção. Visando o controle do mofo cinzento (Botrytis cinerea) na cultura do Lisianthus, este trabalho teve o intuito de avaliar dois métodos de aplicação de fungicidas, a aplicação via gotejamento (fungigação) e a pulverização, com diferentes tratamentos. Os fungicidas utilizados foram: thiofanato metílico (50 g i.a. L-1), thiofanato metílico + chlorothalonil (50 g i.a. L-1 + 35 g i.a. L-1) e iprodione (50 g i.a. L-1). Avaliou-se o número de lesões, o número de botões florais e a altura das plantas de Lisianthus. Foi possível concluir que, tanto na fase de crescimento (número de lesões na planta) como na fase final (número de botões florais) da cultura de Lisianthus, os tratamentos 2 (thiofanato metílico + chlorotalonil) e 3 (iprodione) foram os mais eficientes. Considerando que o tratamento 2 é uma mistura de dois fungicidas, o primeiro sistêmico e o segundo de contato, independente das vias de aplicação, a mistura aumentou a eficiência em relação ao tratamento 1 (thiofanato metílico). Com isso, a aplicação por gotejamento (fungigação), revelou eficiência equivalente à técnica de pulverização. UNITERMOS: Lisianthus, quimigação, irrigação por gotejamento, controle de doenças .  KATZ , I.; CUNHA, A. R. da; SOUSA, A. de P.; HERDANI, E.E.de. COMPARISON OF TWO METHODS OF FUNGICIDE APPLICATION, DRIP IRRIGATION AND CONVENTIONAL SPRAYING CONTROL FOR CINEREOUS MILDEW (Cinerea botrytis Pers.:Fr.) IN POTTED PLANTS OF LISIANTHUS (Eustoma grandiflorum (Raf.) Shinn.)  2 ABSTRACTPlant disease control techniques are used through the irrigation water, which reduces the labor and it improves application uniformity with smaller contact of the operator with toxic products, lower environmental impact and lower production cost. In order to control Botrytis cinerea the Lisianthus culture, this work aimed to evaluate two fungicide application methods with different treatments. The fungicides were: thiophanate methyl (50 gi.a. L-1), thiophanate methyl + chlorothalonil (50 g i.a. L-1 + 35 g i.a. L-1) and iprodione (50 g i.a. L-1). Number of lesions, number of diseased floral buttons and height of the Lisianthus plants were evaluated. It was possible to deduce, that in the growth stage (number of lesions in the plant) as well as in the final stage (number of floral buttons) of the Lisianthus culture, the most efficient treatments were 2 (thiophanate methyl + chlorothalonil) and 3 (iprodione). Considering that treatment 2 is a mixture of two fungicides, a systemic and a contact one, independently of application methods, the mixture increased efficiency in relation to treatment 1 (thiophanate methyl). Thus, chemigation was as efficient as spreading technique. KEYWORDS: Lisianthus, chemigation, drip irrigation, disease control


Author(s):  
Resham B ◽  
◽  
Amrita P ◽  
Anish P ◽  
Bikash G ◽  
...  

A study was conducted from March to August 2020 to evaluate the effectiveness of different fungicides for the management of rhizome rot disease in ginger. The field experiment was conducted under Randomized Complete Block Design with four replication and five treatments; Carbendazim 50% WP @ 1gm/litre + Mancozeb 75% WP @ 2.5gm/litre, Metalaxyl 8% WP + Mancozeb 64% WP @ 2gm/litre, Carbendazim 50% WP @ 1gm/litre, Trichoderma viride @ 5gm/litre and control. The height of pseudo stems, leaf number, germination percentage, tiller number, disease incidence, disease severity and percentage of disease control was recorded during field experiment. There was no significant effect of pre sowing rhizome treatment in height of pseudostems, leaf number and germination percentage. The highest tiller number (3.40) was found with Carbendazim 50% WP @1gm/litre + Mancozeb 75% @ 2.5gm/ litre treatment and lowest tillers number (2.95) was found with control. The highest disease incidence (34.37) and severity (30.03) was found in control plot whereas the lowest disease incidence (2.58) and disease severity (2.46) was found with Carbendazim 50% @ 1gm/litre treatment + Mancozeb 75% @ 2.5gm/litre. Similarly, the highest percentage disease control (85.61) was found with Carbendazim 50% @ 1gm/litre + Mancozeb 75% @ 2.5gm/litre treated rhizome and the lowest (54.14) was found with Trichoderma viride @ 5gm/litre treatment. Therefore, seed treatment with Carbendazim 50%WP @ 1gm/litre + Mancozeb 75% WP @ 2.5 gm/litre is found effective among other fungicides in Bagchaur-3, Salyan and is recommended for enhancing tiller and reducing rhizome rot disease incidence and severity in ginger.


2018 ◽  
Vol 98 (4) ◽  
pp. 971-974 ◽  
Author(s):  
Nader Soltani ◽  
David C. Hooker ◽  
Jonathan Brinkman ◽  
Peter H. Sikkema

The addition of pyraclostrobin, pyraclostrobin/fluxapyroxad, pyraclostrobin/metconazole, trifloxystrobin/propiconazole, azoxystrobin/propiconazole, and trifloxystrobin/prothioconazole fungicides to glyphosate reduced disease incidence up to 19% and disease severity up to 4% compared with glyphosate alone. Fungicides evaluated can be safely mixed with glyphosate for corn production, but fungicide use was not associated with increased corn yield.


Plant Disease ◽  
2001 ◽  
Vol 85 (10) ◽  
pp. 1081-1084 ◽  
Author(s):  
Daniel S. Egel ◽  
Philip Harmon

Methods of fungicide application were evaluated for their influence on the chemical control of Alternaria leaf blight of muskmelon in 1997, 1998, and 1999. Chlorothalonil was applied through either flat-fan or hollow-cone nozzles and with spray pressures ranging from 207 to 1,034 kPa. In all 3 years, unsprayed controls had significantly more disease than any of the sprayed treatments. There was no significant effect of nozzle type on disease severity or yield in any year. Spray pressures of 207, 414, or 620 kPa did not significantly affect disease severity or yield in 1997. In 1998, the 827-kPa pressure significantly lowered disease severity compared with the 207-kPa and 414-kPa pressures, but a similar decrease in the number of lesions per leaf did not occur. Yield responses in 1998 did not support a relationship between spray pressures and disease control. In 1999, spray pressure of 1,034 kPa did not significantly decrease the area under the disease progress curve as estimated from weekly ratings of the disease severity ratings or counts of lesions per leaf made on two dates. Results indicate no differences in disease control due to any of the application methods examined.


2014 ◽  
Vol 44 (1) ◽  
pp. 121-128 ◽  
Author(s):  
Moran Guo ◽  
Jizhen Feng ◽  
Pengying Zhang ◽  
Liyun Jia ◽  
Kaoshan Chen

2013 ◽  
Vol 103 (3) ◽  
pp. 261-267 ◽  
Author(s):  
Manzoor Ali Abro ◽  
François Lecompte ◽  
Florian Bryone ◽  
Philippe C. Nicot

The influence of nitrogen (N) nutrition on a plant's susceptibility to Botrytis spp. and other pathogens is well documented. However, little is known of possible effects on sporulation of the pathogen on diseased tissue and on the pathogenicity of resulting secondary inoculum. To address this question, sporulation by two strains of Botrytis cinerea was quantified on tomato plants produced under different N irrigation regimes with inputs of NO3– at 0.5 to 45 mmol liter–1 (mM). Sporulation decreased significantly (P < 0.05) with increasing N fertilization up to NO3– at 15 to 30 mM. The secondary inoculum was collected and used to inoculate pruning wounds on tomato plants produced under a standard fertilization regime. Pathogenicity of the spores was significantly influenced by the nutritional status of their production substrate. Disease severity was highest with spores produced on plants with very low or very high N fertilization (NO3– at 0.5 or 30 mM). It was lowest for inoculum from plants with moderate levels of N fertilization. These results suggest that it may be possible to find an optimum level of N fertilization to reduce the production of secondary inoculum and its pathogenicity to tomato.


2021 ◽  
Vol 232 ◽  
pp. 03003
Author(s):  
Lina Herlina ◽  
Bonjok Istiaji ◽  
Suryo Wiyono

The success of disease control is largely determined by the validity of information about the type of causal-pathogen. Fusarium oxysporum f. sp. cepae (FOC) was reported to attack shallots and cause leaf twisting disease in Indonesia. We have conducted researches to investigate the causal agent of Fusarium disease and carried out growth tests on nine genotypes of shallots to determine the disease severity and disease indexes, and the correlation between diseases several agronomic traits. Thirty-five strains of Fusarium spp were isolated from wilted shallots tree and bulbs. Based on morphological characterization and rapid test to the isolates, they were identified as F oxysporum, F verticillioides, F solani and F proliferatum. The shallot genotypes that showed a tolerant response to FOC isolates tested were only Sumenep variety. Mentes, Tajuk, Batu Ijo, and Bima Brebes varieties show susceptible response.


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