THE EFFECTS OF RELATIVE HUMIDITY AT THE TIME OF FLOWERING ON FRUIT SET IN BEAR OAK (QUERCUS ILICIFOLIA)

1977 ◽  
Vol 64 (2) ◽  
pp. 159-160 ◽  
Author(s):  
Leonard J. Wolgast ◽  
Benjamin B. Stout
Keyword(s):  
Relative Humidity ◽  
Fruit Set ◽  
Quercus Ilicifolia

Honeybee pollination of the apricot cv. Trevatt

1981 ◽  
Vol 21 (109) ◽  
pp. 241 ◽  
Author(s):  
DF Langridge ◽  
RD Goodman
Keyword(s):  
Relative Humidity ◽  
Fruit Set ◽  
Airborne Pollen ◽  
Optimum Conditions ◽  
Self Pollination

The role of honeybees in the pollination of apricots cv. Trevatt was examined in a 2-year study. When trees were enclosed in cages, the percentage of flowers that set fruit, the weight of fruit harvested per tree and the number of fruit per tree were reduced by 43%, 32% and 50%, respectively. Honeybees comprised 97.6% of insects visiting the flowers, and since 84% of the bees counted were pollen gatherers visiting newly opened flowers, they were more significant pollinators than nectar collecting bees. Optimum conditions for opening and dehiscence of anthers were found to occur at temperatures of 20�C or higher and at 70% relative humidity or less. Parthenocarpy was not a significant factor in fruit set and while self-pollination and possibly some airborne pollen account for some fruit set, this cultivar does benefit from pollination by honeybees.

scholarly journals Role of weather parameters on seasonal abundance of insects in a mangobased agroforestry in Bangladesh, with particular reference to mango hopper

2017 ◽  
Vol 42 (2) ◽  
pp. 197-205
Author(s):  
S Namni ◽  
MR Amin ◽  
MRU Miah ◽  
MF Rahman ◽  
SJ Suh
Keyword(s):  
Relative Humidity ◽  
Significant Positive Correlation ◽  
Fruit Set ◽  
Species Abundance ◽  
Significant Negative Correlation ◽  
Seasonal Abundance ◽  
Insect Species ◽  
Positive Correlation ◽  
Weather Parameters

Weekly sweeping was done by sweep net in order to collect insects to study the effect of weather parameters on the seasonal abundance of total insect species as well as mango hopper population in a mango-based agroforestry in Bangladesh during January to June 2013. The total insect species abundance was the highest during April to May, following the flushing of inflorescence and fruit set. At that time temperature and relative humidity were comparatively higher and there was rainfall. Mango hopper population was the highest in May and synchronized to fruit set. The abundance of total insect species and mango hopper population showed significant positive correlation with temperature, and relative humidity, while significant negative correlation with light intensity and non-significant positive correlation with rainfall. Multiple linear regression equation based on weather parameters revealed 59.2% and 61.7% role on population build up of total insect species and mango hopper, respectively. Temperature was found to be the most important effect which individually contributed 31.3% on population abundance of total insect species and 29.9% on mango hopper.Bangladesh J. Agril. Res. 42(2): 197-205, June 2017

Effect of relative humidity on fruit set and seed set in pepper (Capsicum annuum L.).

1978 ◽  
Vol 26 (1) ◽  
pp. 59-63
Author(s):  
J. Baer ◽  
L. Smeets
Keyword(s):  
Relative Humidity ◽  
Capsicum Annuum ◽  
Fruit Ripening ◽  
Fruit Set ◽  
Seed Set ◽  
Sweet Pepper ◽  
Ripening Period ◽  
Capsicum Annuum L

During 1976, plants of the sweet-pepper variety Verbeterde Glas [Improved Glass] were placed in growth rooms at 55, 80 or 95% relative humidity, at the onset of flowering. The flowers were artificially pollinated until flower drop, and the plants were moved to the glasshouse for the fruit-ripening period. Fruit set was not influenced by relative humidity, but seed set increased with increasing humidity. Time from pollination to harvest was significantly shorter at 95% relative humidity. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Fruit Set of Several Sour Cherry Cultivars in Latvia Influenced by Weather Conditions Before and During Flowering

2017 ◽  
Vol 71 (3) ◽  
pp. 178-183 ◽  
Author(s):  
Daina Feldmane ◽  
Silvija Ruisa ◽  
Valentīna Pole ◽  
Madalina Butac ◽  
Madalina Militaru
Keyword(s):  
Relative Humidity ◽  
Fruit Set ◽  
Pollen Viability ◽  
Sour Cherry ◽  
Temperature Fluctuations ◽  
Weather Conditions ◽  
Germination Capacity ◽  
Negative Effects ◽  
Yield Formation

Abstract Fruit set is a crucial stage in the process of yield formation, which is influenced by environmental factors, growing technologies and peculiarities of genotype. The aim of the study was to evaluate the quality of pollen (viability and germination capacity) and the effect of weather before and during flowering on fruit set in sour cherry cultivars ‘Latvijas Zemais’, ‘Zentenes’, ‘Bulatnikovskaya’, and ‘Orlica’. The research was carried out in Institute of Horticulture (Latvia University of Agriculture) in 2009-2016. Good pollen viability and germination was found for cultivars ‘Latvijas Zemais’ and ‘Bulatnikovskaya’. Negative effects of increasing air temperature (in the range of 7.7 to 17.5 °C) and relative humidity (in the range of 51.4 to 88.5%) was observed for all cultivars during flowering. The effects of diurnal temperature fluctuations, wind and the amount of days with precipitation differed depending on sour cherry cultivar.

scholarly journals Epidemiological Studies of Brown Rot in Spanish Cherry Orchards in the Jerte Valley

2021 ◽  
Vol 7 (3) ◽  
pp. 203
Author(s):  
Inmaculada Larena ◽  
Maria Villarino ◽  
Paloma Melgarejo ◽  
Antonieta De Cal
Keyword(s):  
Relative Humidity ◽  
Critical Period ◽  
Fruit Set ◽  
Brown Rot ◽  
Epidemiological Studies ◽  
Forecasting Model ◽  
Average Temperature ◽  
Percent Relative Humidity ◽  
Cherry Orchard ◽  
The Mean

Cherry brown rot caused by Monilinialaxa was observed and estimated in organic cherry orchard located in the Jerte Valley between 2013 and 2018 (Cáceres, Spain). Climatic variables were collected from this orchard and also from a nearby weather station. The primary inoculum of the pathogen recorded in March was detected in overwintered mummified fruits, ground mummies, and necrotic twigs and was a function of the average temperature of the previous three months (December, January, and February). The first symptoms of brown rot could be observed on flowers until fruit set in April. The months of March and April were identified as the critical period for cherry brown-rot development. A significant positive correlation was identified between brown rot observed at harvest and the mean number of consecutive days in each fortnight of March and April when the percent relative humidity was above 80%. Brown-rot incidence observed over the 6 years ranged from 0 to 38%. More than 11 days with relative humidity >80% in each fortnight of critical period would mean 100% of cherry brown rot at harvest. A forecasting model could be used to predict brown rot infection in Jerte Valley cherries.

scholarly journals The Effect of Mean Daily Temperature and Relative Humidity on Pollen, Fruit Set and Yield of Tomato Grown in Commercial Protected Cultivation

Agronomy ◽  
2014 ◽  
Vol 4 (1) ◽  
pp. 167-177 ◽  
Author(s):  
Danny Harel ◽  
Hadar Fadida ◽  
Alik Slepoy ◽  
Shelly Gantz ◽  
Kobi Shilo
Keyword(s):  
Relative Humidity ◽  
Fruit Set ◽  
Daily Temperature ◽  
Protected Cultivation

scholarly journals Microclimate suitability for green and coloured sweet pepper hybrids in open and protected structures in sub-tropical humid climate of West Bengal

2021 ◽  
Vol 21 (1) ◽  
pp. 12-17
Author(s):  
MALAY K. SAMANTA ◽  
PRANAB HAZRA
Keyword(s):  
Relative Humidity ◽  
Light Intensity ◽  
Open Field ◽  
Field Condition ◽  
Climatic Condition ◽  
Fruit Set ◽  
Sweet Pepper ◽  
Humid Climate ◽  
Reduced Light ◽  
Open Field Condition

A study was undertaken for two consecutive seasons (autumn-winter) to evaluate the performance of three green, red and yellow-fruited sweet pepper hybrids in open field and under two protected structures (50% green shade net house and naturally-ventilated polyhouse) to understand the microclimate suitability for maximizing the productivity of these hybrids under sub-tropical humid climatic condition of eastern India. In this climatic condition, naturally-ventilated polyhouse was most suitable for enhancing fruit yieldof both green and coloured fruited hybrids. Open field condition was not suitable for both yellow and redfruited hybrids. Though green-fruited hybrids could be grown in open field condition, fruit yield was more than double under polyhouse. Shade net house could not be considered as a suitable protected structure for sweet pepper in this climatic condition because of reduced light intensity and high relative humidity inside it causing low fruit set and high incidence of bacterial wilt disease. Maximum/minimum temperature30oC to 33oC / 14oC to 17oC with comparatively reduced light intensity of 35,000 to 55,000 lux, prevention of adverse effect of low night temperature during winter and  60 per cent relative humidity condition during flowering, fruit set and fruit development period inside the naturally ventilated polyhouse were most suitable growing conditions for getting maximum productivity of both green and colour-fruited hybrids of sweet pepper.

scholarly journals Phyl-Gold: a product to diminish russeting of 'Golden Delicious' apples

2000 ◽  
Vol 6 (1) ◽  
Author(s):  
L. Csiszár ◽  
T. Bubán ◽  
F. Takács ◽  
M. Benedictyné Rátz ◽  
L. Oláh
Keyword(s):  
Side Effects ◽  
Relative Humidity ◽  
Fruit Set ◽  
Plant Protection ◽  
High Relative Humidity ◽  
Mature Trees ◽  
High Quality ◽  
Fruit Skin ◽  
Golden Delicious ◽  
Return Bloom

Producing high quality apples in mature trees of the cv. 'Golden Delicious' is rather difficult because of the russeting of it's fruits, especially in seasons of high relative humidity and/or wetness. Earlier experiments proved the possibility to decrease russeting by treatments of GA4.7 during a period after petal fall. Phyl-Gold, a product of Phylaxia Co. (ai. 10 g1-1 GA4.7) was applied to inhibit russet formation in fruit skin of 'Golden Delicious' apples. Four consecutive sprays were carried out (with 10 ppm a.i.) in weekly intervals, starting at petal fall and tank-mixed with the current pesticides of the plant protection program. Due to the GA4.7 application the russet formation decreased at a rate of economical importance. As for the side-effects of treatments, fruit set was reduced slightly in trees treated, however, there was no consequent influence on return bloom.  

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