Influence of different temperature and relative humidity levels on the mycelial growth, conidial germination and anthracnose incidence of Colletotrichum gloeosporioides

1970 ◽  
pp. 31
Author(s):  
R. UDHAYAKUMAR
Keyword(s):  
Relative Humidity ◽  
Mycelial Growth ◽  
Room Temperature ◽  
Colletotrichum Gloeosporioides ◽  
Disease Incidence ◽  
Management Strategies ◽  
Conidial Germination ◽  
Relative Humidity Level ◽  
Humidity Level ◽  
Temperature Levels

Mango anthracnose caused by Colletotrichum gloeosporioides is a highly destructive pathogen that causes considerable damage, inflicting severe qualitative and quantitative losses. Among the external factors which influence the growth of fungi, temperature and relative humidity plays an important role. Each pathogen has got its own cardinal temperature and relative humidity, also understanding about these factors will help to standardize the management strategies. Among the six temperature levels tested, 25°C was found to be more conducive for the mycelial growth (88.33 mm), conidial germination (69.00%) of C. gloeosporioides, and maximum disease development (97.00 %) which was followed by room temperature (28+2°C).The maximum disease incidence of 97.00 per cent in the fruits was recorded at 25oC followed by room temperature (28±2oC) (83.33 %) after 10 days of inoculation. Among the seven relative humidity levels tested, the maximum mycelial growth (87.00 mm), conidial germination (72.00%) and maximum disease incidence (97.00 %) was recorded at 100 per cent relative humidity, which was followed by 92.9% relative humidity level (83.00 mm; 61.67% mycelial growth and conidia germination, respectively). The least mycelial growth (7.33 mm) and conidial germination (0.0%) was recorded at 36.8% relative humidity level.

scholarly journals Bacterial Inhibition on Beauveria bassiana Contributes to Microbiota Stability in Delia antiqua

2021 ◽  
Vol 12 ◽  
Author(s):  
Fangyuan Zhou ◽  
Yunxiao Gao ◽  
Mei Liu ◽  
Letian Xu ◽  
Xiaoqing Wu ◽  
...  
Keyword(s):  
Beauveria Bassiana ◽  
Mycelial Growth ◽  
Bacterial Species ◽  
Management Strategies ◽  
Underlying Mechanism ◽  
Conidial Germination ◽  
Delia Antiqua ◽  
Bacterial Microbiota ◽  
Fungal Microbiota ◽  
Microbial Environment

Given the multiple roles of associated microbiota in improving animal host fitness in a microbial environment, increasing numbers of researchers have focused on how the associated microbiota keeps stable under complex environmental factors, especially some biological ones. Recent studies show that associated microbiota interacts with pathogenic microbes. However, whether and how the interaction would influence microbiota stability is limitedly investigated. Based on the interaction among Delia antiqua, its associated microbiota, and one pathogen Beauveria bassiana, the associated microbiota's response to the pathogen was determined in this study. Besides, the underlying mechanism for the response was also preliminarily investigated. Results showed that B. bassiana neither infect D. antiqua larvae nor did it colonize inside the associated microbiota, and both the bacterial and fungal microbiota kept stable during the interaction. Further experiments showed that bacterial microbiota almost completely inhibited conidial germination and mycelial growth of B. bassiana during its invasion, while fungal microbiota did not inhibit conidial germination and mycelial growth of B. bassiana. According to the above results, individual dominant bacterial species were isolated, and their inhibition on conidial germination and mycelial growth of B. bassiana was reconfirmed. Thus, these results indicated that bacterial instead of fungal microbiota blocked B. bassiana conidia and stabilized the associated microbiota of D. antiqua larvae during B. bassiana invasion. The findings deepened the understanding of the role of associated microbiota–pathogen microbe interaction in maintaining microbiota stability. They may also contribute to the development of novel biological control agents and pest management strategies.

scholarly journals Control of Sphaeropsis Rot in Stored Apple Fruit Caused by Sphaeropsis pyriputrescens with Postharvest Fungicides

Plant Disease ◽  
2011 ◽  
Vol 95 (9) ◽  
pp. 1075-1079 ◽  
Author(s):  
C. L. Xiao ◽  
Y. K. Kim ◽  
R. J. Boal
Keyword(s):  
Mycelial Growth ◽  
Disease Incidence ◽  
Apple Fruit ◽  
Conidial Germination ◽  
Fruit Rot ◽  
Mitigation Measures ◽  
The Mean ◽  
Rot Disease ◽  
Sphaeropsis Rot

Sphaeropsis rot caused by Sphaeropsis pyriputrescens is a recently reported postharvest fruit rot disease of apple grown in Washington State. The objective of this study was to develop chemical-based mitigation measures for Sphaeropsis rot in stored apple fruit. To determine in vitro sensitivity of S. pyriputrescens to the three registered postharvest fungicides thiabendazole, fludioxonil, and pyrimethanil, 30 isolates of S. pyriputrescens obtained from various sources were tested for mycelial growth and conidial germination on fungicide-amended media. Golden Delicious apple fruit were inoculated with the pathogen in the orchard at 2 or 5 weeks before harvest. After harvest, fruit were either nontreated or dipped in thiabendazole, fludioxonil, or pyrimethanil solutions, stored at 0°C, and monitored for decay development for up to 9 months after harvest. The mean effective concentration of a fungicide that inhibits mycelial growth or spore germination by 50% relative to the nonamended control (EC50) values of thiabendazole, fludioxonil, and pyrimethanil on mycelial growth were 0.791, 0.0005, and 2.829 μg/ml, respectively. Fludioxonil and pyrimethanil also were effective in inhibiting conidial germination of the fungus with EC50 values of 0.02 μg/ml for fludioxonil and 5.626 μg/ml for pyrimethanil. All three postharvest fungicides applied at label rates immediately after harvest were equally effective in controlling Sphaeropsis rot in stored apple fruit, reducing disease incidence by 92 to 100% compared with the nontreated control. The results indicated that Sphaeropsis rot may be effectively controlled by the currently registered postharvest fungicides thiabendazole, fludioxonil, and pyrimethanil.

scholarly journals Some Characteristics Of Transpiration Of Promising Soybean’s Varieties

2021 ◽  
Vol 03 (05) ◽  
pp. 28-35
Author(s):  
Kholliyev Askar Ergashovich ◽  
◽  
Fozilov Sherzod Musurmonovich ◽  
Keyword(s):  
Relative Humidity ◽  
Diurnal Variation ◽  
Cross Section ◽  
Air Temperature ◽  
Biological Characteristics ◽  
Relative Humidity Level ◽  
Flowering Stage ◽  
Humidity Level ◽  
Relative Decrease ◽  
The Cross

The article presents data obtained from the study of the daily intensity of transpiration during the flowering stage of soybean varieties. According to the data on the diurnal variation of transpiration intensity, this process was accelerated in Vilana and Ustoz MM-60 varieties of soybeans, and a relative decrease in intensity was observed in Baraka and Tomaris man-60 varieties. Different variations in the intensity of transpiration in the cross section of the studied varieties may depend on the biological characteristics of the varieties as well as the air temperature and its relative humidity level.

scholarly journals Effect of Relative Humidity on Mycelial Growth of Cercospora canescens

2021 ◽  
Vol 9 (3) ◽  
pp. 276-278
Author(s):  
Naresh Kumar ◽  
Keyword(s):  
Relative Humidity ◽  
Mycelial Growth ◽  
Mycelium Growth ◽  
Humidity Level ◽  
Mycelia Growth ◽  
Cent Relative Humidity ◽  
Relative Humidity Range ◽  
Humidity Range

The relative humidity studies revealed that maximum mycelial of fungus was observed at 90 per cent relative humidity (89.00 mm), which was followed by 100 per cent (86.30 mm). The least mycelia growth was observed at 50 per cent (45.30 mm). A significant decrease in mycelium growth was observed at 80, 70 and 60 per cent (80.40 mm, 70.20 mm and 57.00 mm) humidity level, respectively. Each fungus has its relative humidity range for the growth.

scholarly journals Requerimientos de humedad relativa y tiempos de incubación para la infección de conidios de Colletotrichum gloeosporioides en frutos de papaya.

2016 ◽  
Vol 9 (1) ◽  
pp. 81 ◽  
Author(s):  
Alfredo Durán ◽  
Lenín Ramírez ◽  
Dennis Mora
Keyword(s):  
Relative Humidity ◽  
Incubation Time ◽  
Initial Phase ◽  
Colletotrichum Gloeosporioides ◽  
Disease Incidence ◽  
Hot Water ◽  
Second Phase ◽  
Damage Level ◽  
The University ◽  
Erratic Behavior

The research was carried out at the University of Costa Rica's phytopathology laboratory between October 1995 and March 1996. In an initial phase, some creole papaya fruits from Gu.cimo (Limón province) were used. In order to eliminate latent infections, they were washed and immersed in hot water (49° C for 20 minutes). The fruits were then randomly placed in groups of 20, which conformed each treatment. Finally, they were inoculated by spraying with 5.5 ml of a 10.000 Colletotrichum gloeosporioides spores per mililiter suspension; then they were placed in plastic boxes and stored in containers with a 30°C temperature and relative humidities of 70%, 80%, and 90%. Fruits were kept in the compartments for periods of 5, l0, 15, 20 and 25 hours. Temperature and relative humidity were monitored during the experiment through the incubator's sensors and with a portable hydrothermograph. Finally, the incidence and severity of anthracnose was evaluated. During the second phase, fruits of the Hawaiian sunrise variety were used, following the same procedures applied to the native fruits. In native fruits, 100% of those placed at 80% and 90% relative humidity were contaminated after being in the compartment for five hours. The incidence decreased in the group with 70% relative humidity. The damage level increased with increases in relative humidity, although some erratic behavior was observed. In the test with Hawaiian fruit, the disease incidence increased according with incubation time. Severity showed a similar behavour; however, there was also erratic behavour here.

scholarly journals Lowering relative humidity level increases epidermal protein deimination and drives human filaggrin breakdown

2017 ◽  
Vol 86 (2) ◽  
pp. 106-113 ◽  
Author(s):  
Laura Cau ◽  
Valérie Pendaries ◽  
Emeline Lhuillier ◽  
Paul R. Thompson ◽  
Guy Serre ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Relative Humidity Level ◽  
Humidity Level

Design of Polyimide-Coated Yagi-Uda Antennas for Monitoring the Relative Humidity Level

2017 ◽  
Vol 14 (6) ◽  
pp. 961-963 ◽  
Author(s):  
Aaron Angel Salas-Sanchez ◽  
Maria Elena Lopez-Martin ◽  
Juan Antonio Rodriguez-Gonzalez ◽  
Francisco Jose Ares-Pena
Keyword(s):  
Relative Humidity ◽  
Relative Humidity Level ◽  
Humidity Level

scholarly journals Evaluation of Fungicides and Management Strategies against Cercospora Leaf Spot of Olive Caused by Pseudocercospora cladosporioides

Agronomy ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 271
Author(s):  
Joaquín Romero ◽  
Arantxa Ávila ◽  
Carlos Agustí-Brisach ◽  
Luis F. Roca ◽  
Antonio Trapero
Keyword(s):  
Leaf Spot ◽  
Mycelial Growth ◽  
Management Strategies ◽  
Conidial Germination ◽  
Field Conditions ◽  
Cercospora Leaf Spot ◽  
Wide Range ◽  
Traditional Strategy ◽  
Mediterranean Conditions

Cercospora leaf spot of olive (CLSO), caused by Pseudocercospora cladosporioides, is one of the most important foliar diseases of olives worldwide. This study aimed to evaluate the effect of a wide range of fungicides on mycelial growth and conidial germination of P. cladosporioides in vitro, and to evaluate the effect of several fungicides, application timings and management strategies (conservative and risky) to control CLSO under field conditions. Of the studied fungicides, strobilurin compounds and benomyl were the most effective active ingredients, followed by folpet, captan and maneb, in inhibiting mycelial growth and conidial germination. The pyraclostrobin + boscalid treatment was effective under field conditions, even without the application of supplementary copper. Treatments conducted in October or March were more effective than those conducted in May. Management strategies based on the author’s experience reduced copper applications up to 32.0% and 50.0% (conservative and risky strategy, respectively) in comparison to the reduction with the traditional strategy, without increasing CLSO incidence. This work provides useful information about effective formulations against CLSO and a reduction in unnecessary fungicide applications in an effort to implement IPM in olive orchards under Mediterranean conditions.

EFFECT OF HUMIDITY ON THE LONGEVITY OF POPULUS AND ULMUS SEEDS IN STORAGE

1946 ◽  
Vol 24c (6) ◽  
pp. 298-302 ◽  
Author(s):  
L. P. V. Johnson
Keyword(s):  
Relative Humidity ◽  
Populus Tremuloides ◽  
Room Temperature ◽  
Seed Viability ◽  
Storage Condition ◽  
Humidity Level ◽  
Humidity Range

Storage of Populus tremuloides and P. grandidentata seeds at room temperature in a controlled-humidity series showed the optimum to be 20% relative humidity for both species. At this humidity level, seed viability was retained by P. grandidentata for 555 days and by P. tremuloides for 455 days, as compared to approximately 28 days for both checks (open air).Similar storage of seeds of four Ulmus species showed tolerance of a wide humidity range by all species, the optimum storage condition being within a range of approximately 20 to 50% relative humidity.Germinability in all four Ulmus species was greatly increased when seeds were tested in a lighted germinator.

Sign in / Sign up

Export Citation Format

Share Document