Effect of humidity and light periods on infection and sporulation of Peronospora viciae on Pisum sativum

1981 ◽  
Vol 59 (12) ◽  
pp. 2515-2518
Author(s):  
H. Singh
Keyword(s):  
Relative Humidity ◽  
Pisum Sativum ◽  
Dark Period ◽  
Continuous Light ◽  
High Relative Humidity ◽  
High Humidity ◽  
Peronospora Viciae

Plants grown in high relative humidity (RH > 90%) before inoculation supported more sporulation than those kept in drier (RH < 30%) conditions. Sporulation of Peronospora viciae (Berk.) Casp. on Pisum sativum (Berk.) Casp. cv. Superb was lower on plants kept under continuous light for 2 weeks before inoculation than on those maintained in a 12 h light: 12 h dark photoperiod. Treatments involving longer photoperiods after inoculation resulted in greater sporulation (intensity) than those where inoculation was followed by an extended dark period. A minimum of 6 h of high humidity (RH > 90%) in the dark was required to initiate sporulation. However, this period was reduced to 3 h if replaced by lower humidity conditions (RH 65%).

Stiffness Reduction of Woven CFRP and CFRTP Spring under Ultra High Cyclic Fatigue for Vibration Conveyor

2010 ◽  
Vol 123-125 ◽  
pp. 217-220 ◽  
Author(s):  
Takahiko Yoshi ◽  
Kazuya Okubo ◽  
Toru Fujii
Keyword(s):  
Cyclic Loading ◽  
Relative Humidity ◽  
Fatigue Loading ◽  
Cyclic Fatigue ◽  
High Relative Humidity ◽  
Carbon Cloth ◽  
High Humidity ◽  
Stiffness Reduction ◽  
Plate Spring ◽  
High Humidity Condition

This paper investigated the stiffness reduction of the plate spring made of CFRP (Carbon cloth and epoxy) subjected to ultra high cyclic fatigue loading under high relative humidity. For practical uses, this paper proposes a new design which prevents the significant degradation with stiffness change of the plate spring at high humidity. Remarkable stiffness reduction of the plate spring due to cracks and delaminations around inter layer could be prevented by using CFRTP rather than that by using CFRP, when ultra high cyclic loading was applied to the plate spring under high humidity condition.

scholarly journals High Relative Humidity after Ethylene Gassing is Important to Banana Fruit Quality

1995 ◽  
Vol 5 (2) ◽  
pp. 150-151 ◽  
Author(s):  
Sylvia M. Blankenship ◽  
Robert W. Herdeman
Keyword(s):  
Relative Humidity ◽  
Fruit Quality ◽  
High Relative Humidity ◽  
High Humidity ◽  
Banana Fruit ◽  
Fruit Firmness ◽  
Compression Injury ◽  
Peel Color ◽  
Before And After ◽  
Low Humidity

Bananas were held at 18C in all possible combinations of 65%, 75%, or 95% relative humidity (RH) before and after gassing with ethylene. Peel color, fruit firmness, starch loss, compression injury to peel and pulp, and overall peel scarring were measured. Peels were greener and the fruit were slightly firmer when fruit were held in the higher humidity combinations, particularly when the humidity was high after gassing with ethylene. Starch loss was not different among humidity treatments. Overall peel scarring was about twice as severe with 65% RH compared to 95% RH during the ripening phase. Low humidity before ethylene gassing had little effect on overall scarring. There were some instances where humidity had a significant effect on compression injury; high humidity caused less injury, but the effect was inconsistent.

Persistence of nosocomial bacteria on 2 biocidal fabrics based on silver under conditions of high relative humidity

2014 ◽  
Vol 42 (8) ◽  
pp. 879-884 ◽  
Author(s):  
Rosa López-Gigosos ◽  
Alberto Mariscal ◽  
Mario Gutierrez-Bedmar ◽  
Eloisa Mariscal-Lopez ◽  
Joaquín Fernández-Crehuet
Keyword(s):  
Relative Humidity ◽  
High Relative Humidity

Electrostatics demonstrations at high relative humidity

1984 ◽  
Vol 52 (1) ◽  
pp. 86-86 ◽  
Author(s):  
William Lichten ◽  
Paul McGrath
Keyword(s):  
Relative Humidity ◽  
High Relative Humidity

Seasonal Incidence of Pulse Aphid (Aphis craccivora Koch.) and its Natural Enemies on Field Pea (Pisum sativum L.) in Relation to Some Abiotic Factors in Alluvial Zone of West Bengal

2021 ◽  
Author(s):  
S. Pal ◽  
S. Samanta ◽  
A. Banerjee
Keyword(s):  
Relative Humidity ◽  
Pisum Sativum ◽  
Natural Enemies ◽  
West Bengal ◽  
Insect Pests ◽  
Field Pea ◽  
Pest Population ◽  
Pisum Sativum L ◽  
Aphis Craccivora Koch ◽  
Weather Parameters

Background: Field pea, Pisum sativum L. is an important winter-season pulse crop. It is subjected to damage by both field and storage insect pests and approximately 10-15 per cent reduction in yield was reported due to the infestation of different insect pests. Among these, pulse aphid (Aphis craccivora Koch.) affects plant physiology directly by removal of nutrients or indirectly by dispersal of various viral diseases. The present investigation has been aimed to study the seasonal fluctuations of aphids and their natural enemies as well as their correlation. Another objective was to know the effect of various weather parameters on pulse aphids and their natural enemies which ultimately would be helpful to develop a forewarning model.Methods: The field experiment was conducted at the A-B Block Farm of Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal using two varieties of field pea (KPMR 935 and IFPD 122) during rabi seasons of two consecutive years of 2017-18 and 2018-19 following a Randomized Block Design with three replications. After recording the total population of both pests (nymphs and adults) and their natural enemies across the season, the mean population was worked out and used for correlation and regression studies along with the weather parameters. Result: Maximum aphid population was noticed during the peak pod formation stage of the crop irrespective of the varieties. The pest population was very strongly correlated with the incidence of coccinellid and ant population in both test varieties. Among the weather parameters, both maximum and minimum temperature and sunshine hour showed a positive correlation with the pest population and their natural enemies but relative humidity and rainfall showed a negative correlation. Regression studies indicated that temperature and relative humidity were the most influencing factors over the incidence of aphid in both the seasons.

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