Population dynamics of the whitebacked planthopper,Sogatella furcifera (Hemiptera: Delphacidae) with special reference to the relationship between its population growth and the growth stage of rice plants

1996 ◽  
Vol 38 (1) ◽  
pp. 19-25 ◽  
Author(s):  
Masaya Matsumura
Keyword(s):  
Population Dynamics ◽  
Population Growth ◽  
Special Reference ◽  
Growth Stage ◽  
Sogatella Furcifera ◽  
Rice Plants ◽  
Whitebacked Planthopper ◽  
The Relationship

scholarly journals Dinamika populasi wereng punggung putih, sogatella furcifera Stål (Hemiptera: Delphacidae) di jawa tengah

2017 ◽  
Vol 3 (1) ◽  
pp. 1
Author(s):  
I Nyoman Widiarta ◽  
E.S. Wijay ◽  
Hiroichi Sawada
Keyword(s):  
Population Density ◽  
Population Growth ◽  
Brown Planthopper ◽  
Rice Cultivar ◽  
Growth Patterns ◽  
Thermal Constant ◽  
Sogatella Furcifera ◽  
Wet Season ◽  
Crop Season ◽  
Whitebacked Planthopper

A field study was conducted at paddy fields in Petarukan and Pekalongan regencies of Central Java province during wet season crop 1989/90 and 1990/91 to elucidate population dynamic of whitebacked planthopper, Sogatella furcifera Stål. Seven and three observation fields were set up in 1989/90 and the 1990/91, respectively. Cisadane rice cultivar was transplanted following the usual farmer’s parctices except that no pesticide was applied. The population of the whitebacked planthopper and the brown planthopper, (Nilaparvata lugens Stål) were sampled by using an insect suction catcher, a farmcop. Identification of generation was based on thermal constant required by the whitebacked planthopper to complete one generation and mean population density was calculated by graphical method. Two distinct seasonal population growth patterns were identified. The population with short population growth pattern completed four generations in one crop season in which their population density increased consecutively in two generations since immigrant generation, and thereafter decreased. The population with long population growth completed five generations in one crop season in which their population density increased consecutively in three generations, and thereafter decreased. The density of brachiptera adults determined 90% of the total population density. The proportion of brachiptera adults were not correlated with large nymphal density in both vegetative and generative stages of rice. The proportion of brachiptera adults showed significant negative linear regression with population density of the brown planthopper. Therefore, interspesific competition determined the proportion of wingform and population dynamics of the whitebacked planthopper.

THE RELATIONSHIP BETWEEN QUANTITATIVE CHANGES OF PLANKTON AND POPULATION DYNAMICS OF CRASPEDACUSTA IN A SMALL POOL

2010 ◽  
Vol 36 (1) ◽  
pp. 121-128
Author(s):  
Shan-Liang XU ◽  
Dan-Li WANG ◽  
Chun-Fen SU ◽  
Li-Li WANG
Keyword(s):  
Population Dynamics ◽  
Small Pool ◽  
Quantitative Changes ◽  
The Relationship

Cooperation between universities and SMEs: A systematic literature review

2021 ◽  
pp. 095042222199511
Author(s):  
Rosivalda Pereira ◽  
Mário Franco
Keyword(s):  
Literature Review ◽  
Systematic Literature Review ◽  
Growth Stage ◽  
Innovation System ◽  
Objective Data ◽  
Main Difficulty ◽  
Study Objective ◽  
Cooperative Relationships ◽  
Scopus Database ◽  
The Relationship

This study aims to present the relationship between universities and small and medium-sized enterprises (SMEs) through a systematic literature review. SMEs play an important role in economic development. Similarly, universities are important actors in the innovation system. To fulfil the study objective, data were collected from the Scopus database. The bibliometric results found, using bibliometrix software, reveal that this topic first appeared in the literature in 1995 and entered a growth stage in 2014. Systematically, studies have focused mostly on European countries and the emphasis in cooperation is on knowledge transfer. In addition, the results show that SMEs form cooperative relationships with universities in search of competitive results. However, the main difficulty with regard to the establishment of such relationships is a lack of knowledge in SMEs about university programmes that can support them and about how to access such programmes. Therefore, it is suggested that universities should establish more effective communication channels in order to reach this type of firm.

Sign in / Sign up

Export Citation Format

Share Document