scholarly journals Effect of Temperature and Relative Humidity on the Growth and Development of Acridid Grasshopper, Chrotogonus trachypterus Blanchard

2020 ◽  
Author(s):  
S. , , Meena ◽  
V. Kumari ◽  
N. Singh
Keyword(s):  
Relative Humidity ◽  
Growth And Development ◽  
Management Strategy ◽  
Ecological Factors ◽  
Effect Of Temperature ◽  
Growth Study ◽  
Average Fecundity ◽  
Males And Females ◽  
Test Insect ◽  
Different Levels

Growth and development of acridid grasshopper, Chrotogonus trachypterus Blanchard was greatly influenced by different levels of temperature (20, 25, 30, 35 and 37oC) and relative humidity (40, 60 and 70%). A laboratory study was revealed that temperature between 30-35oC with 60% relative humidity is mostly suitable for life cycle of the test insect. Maximum oviposition period was 54.6±2.21 days at 25oC whereas, maximum hatching percent was recorded at 30oC (90.6±1.18). Average fecundity of a female increased with the increase in temperature up to 35oC (242.1±2.55) but decreased at 37oC. Developmental period of nymphs was longer at 20oC as 94.03±3.45 and 105.3±3.16 days for males and females whereas, nymphs quickly developed at 37oC within 50.3±0.55 and 60.2±2.44 days, respectively. Highest survivability was obtained at 25o and 30oC. Relative humidity ranged from 60-70% gave non-significant differences and found to be most suitable for insect growth. Study of interaction of ecological factors will be helpful in management strategy of the pest and future adaptation behavior and outbreak issues.

scholarly journals Development and reproduction of Podisus distinctus (Heteroptera: Pentatomidae) fed on larva of Bombyx mori (Lepidoptera: Bombycidae)

2004 ◽  
Vol 64 (2) ◽  
pp. 237-242 ◽  
Author(s):  
M. C. Lacerda ◽  
A. M. R. M. Ferreira ◽  
T. V. Zanuncio ◽  
J. C. Zanuncio ◽  
A. S. Bernardino ◽  
...  
Keyword(s):  
Biological Control ◽  
Life Cycle ◽  
Relative Humidity ◽  
Bombyx Mori ◽  
Insect Pests ◽  
Males And Females ◽  
Heteroptera Pentatomidae ◽  
Bombyx Mori L ◽  
Chemical Products ◽  
Coleoptera Tenebrionidae

Biological control has been reducing the use of chemical products against insect pests, specially predatory Pentatomidae. Species of this group can present high variations in their life cycle as a result of their diet. Thus, the objective of this research was to study nymph development and reproduction of Podisus distinctus (Stäl, 1860) (Heteroptera: Pentatomidae) fed on Bombyx mori L., 1758 (Lepidoptera: Bombycidae) larvae (T1), compared to those fed on Tenebrio molitor L., 1758 (Coleoptera: Tenebrionidae) (T2) and Musca domestica L., 1758 (Diptera: Muscidae) larvae (T3) at a temperature of 25 ± 0.5ºC, relative humidity of 70 ± 2%, and photophase of 12 h. Predators fed on B. mori showed duration of the nymph phase (18.68 ± 1.02) similar to those fed on T. molitor (18.32 ± 1.49). Pre-oviposition and oviposition periods and number of egg masses, besides eggs and nymphs per female, were higher with B. mori (5.83 ± 2.02; 15.00 ± 7.40; 8.42 ± 1.84; 296.69 ± 154.75; and 228.55 ± 141.04, respectively) while longevity of males and females of P. distinctus was 25.76 ± 16.15 and 35.00 ± 16.15 days with T. molitor, and 20.57 ± 13.60 and 23.46 ± 12.35 days with B. mori, respectively.

Romantic Partners in a Market Perspective: Expectations about What Ensures a Highly Desirable Partner

2013 ◽  
Vol 113 (2) ◽  
pp. 605-618 ◽  
Author(s):  
Felipe N. Castro ◽  
Wallisen T. Hattori ◽  
Maria Emília Yamamoto ◽  
Fívia A. Lopes
Keyword(s):  
Social Skills ◽  
Statistical Models ◽  
Physical Attractiveness ◽  
Romantic Partners ◽  
Evolutionary Perspective ◽  
Status Characteristics ◽  
Males And Females ◽  
Biological Market ◽  
Different Levels ◽  
Market Perspective

This study used the biological market perspective and influential statistical models from the marketing field to investigate males' and females' expectations regarding which combination of characteristics are most relevant in ensuring desirable partnerships for same-sex individuals. Thus, 358 Brazilian undergraduates assessed eight descriptions of same-gender stimulus targets (formulated with different levels of physical attractiveness, social skills, and current or prospective social status) and evaluated the overall desirability of the targets' expected or probable partners. From the possible combinations, three groups emerged: for one group, mainly composed of men, status characteristics were the most important attributes; for the others, mostly composed of women, social skills or physical characteristics were identified as most important in appealing to a desirable partner. This work expands the understanding of variability in male and female romantic expectations, and its implications are discussed from an evolutionary perspective.

The effect of post-harvest storage on the weight of Golden Delicious apples

2021 ◽  
Vol 13 (2) ◽  
pp. 7-11
Author(s):  
Salma Kassebi ◽  
Péter Korzenszky
Keyword(s):  
Relative Humidity ◽  
Storage Temperature ◽  
Extended Period ◽  
Food Products ◽  
Significant Loss ◽  
Loss Of Weight ◽  
Ambient Storage ◽  
Golden Delicious ◽  
Different Levels ◽  
Careful Management

Apples, like other fruits, are exposed to stress during their growth and development in the field, also during harvest and the postharvest environment (processing, storage, and transportation). The refrigeration system allows for bulk handling of food products from harvest to market, ensuring that food products are maintained in their freshness and integrity for an extended period through careful management of storage temperature and humidity. This study investigated the effects of storage on the weight loss of apples (Golden Delicious fruits harvested at maturity), under refrigerated conditions at a temperature of 5±0.5°C and relative humidity of 82% and under ambient storage at a temperature of 25 ±0.5 °C and relative humidity of 60 %, over 3 months. The findings revealed that the two groups of apples experienced weight reduction at different levels. Apples placed at cold storage presented a loss of weight between 3.31g and 4.49g; however, apples stored at ambient temperature showed a significant loss of weight between 21.9g and 31.76g.

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