Articles
POPULATION OF CHRYSOPERLA CARNEA (STEPHEN’S) ON DIFFERENT VEGETABLE CROPS
Article number
1054_9
Pages
89 – 94
Language
English
Abstract
A study in population fluctuation of Chrysoperla carnea (Stephens) on different vegetable crops was carried out during the Rabi season of 2007-08 in a greenhouse in Tandojam.
The mean population of C. carnea had its peak (2.75), (1.52), (2.1) and (0.97) in cauliflower, tomato, potato and turnip per plant, respectively on 19 March, after which it declined as the crops matured.
The population of predators on all crops was the highest with an increasing rate of 0.222X and r2=0.93 which indicated that there was 93% variation in the population of predators by weeks.
A positive and highly significant correlation was observed between the population and dates (r=0.96). Thereafter, the population of predators decreased on 30 April with a decreasing rate of -0.345X and r2=0.99. It further showed that there was a highly significant correlation between population and dates (r=0.99). The comparative population of predators indicated that it was maximum (1.72) on cauliflower, followed by potato (0.87), tomato (0.65) and turnip (0.38), respectively.
The analysis of variance (ANOVA) revealed that the predator population varied significantly with different crops (F=2.61 df=3, P< 0.05). The data showed that there was a positive and highly significant correlation between temperature and the population of C. carnea through an in situ plant count method (r=0.668). The correlation of humidity with the population of C. carnea was negative and non-significant (r=-0.122). It may be concluded that the population density of C. carnea was more on cauliflower plants and in the field.
It can be utilized in the integrated pest management in cauliflowers.
The mean population of C. carnea had its peak (2.75), (1.52), (2.1) and (0.97) in cauliflower, tomato, potato and turnip per plant, respectively on 19 March, after which it declined as the crops matured.
The population of predators on all crops was the highest with an increasing rate of 0.222X and r2=0.93 which indicated that there was 93% variation in the population of predators by weeks.
A positive and highly significant correlation was observed between the population and dates (r=0.96). Thereafter, the population of predators decreased on 30 April with a decreasing rate of -0.345X and r2=0.99. It further showed that there was a highly significant correlation between population and dates (r=0.99). The comparative population of predators indicated that it was maximum (1.72) on cauliflower, followed by potato (0.87), tomato (0.65) and turnip (0.38), respectively.
The analysis of variance (ANOVA) revealed that the predator population varied significantly with different crops (F=2.61 df=3, P< 0.05). The data showed that there was a positive and highly significant correlation between temperature and the population of C. carnea through an in situ plant count method (r=0.668). The correlation of humidity with the population of C. carnea was negative and non-significant (r=-0.122). It may be concluded that the population density of C. carnea was more on cauliflower plants and in the field.
It can be utilized in the integrated pest management in cauliflowers.
Authors
J.M. Mari, G.A. Bugti, M.A. Rustamani
Keywords
population, Chrysoperla carnea, vegetable
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