Document Details

Document Type : Thesis 
Document Title :
Studies on whiteflies that infest vegetable plants in greenhouses
دراسات على الذباب الأبيض الذي يصيب نباتات الخضر في البيوت المحمية
 
Subject : Girls' College of Education in Jeddah 
Document Language : Arabic 
Abstract : Bemisia tabaci is widely distributed all over the world.In Saudi Arabia,whiteflies cause several damage to economic vegetable crops. This insect grown in greenhouses sucking from the plant and transmitting viruses. Therefore , the present research aimed to determine the population dynamics of the whitefly B. tabaci on six plants varieties by using yellow sticky traps , to collect the adults during one year (autumn , winter , spring and summer) on order determine the outbreak of this insect and host plant preference in greenhouses. This work also include study of some biochemical changes in infested plant leaves namely ; pH , phenol , amino acid and some mineral elements aimed also to study the effect of the earth magnetic field on the whitefly flight direction (main and half way) and the color preference of B. tabaci adults. From these data it can be conclude that , B. tabaci adult were most abundant on cantaloupe , and the autumn season was the available season for the whitefly. The highest insects number was collected on traps located at the north direction of the greenhouse. In addition the study showed that the highest value of amino acid content was in the cantaloupe and eggplant. Amino acid content of all infested plants was less than that of non infested plants during all season , and the mean percent value of elements on varieties of vegetable were significantly different from each other of means number also , the infestation led to significant increase in phenol content of all infested plants. As regard to pH value in lower plants leaves recorded the highest one followed by middle and upper leaves which recorded the least values. The infestation of this insect had led to lowering the pH value in all vegetable leaves except for cucumber. As for the geomagnetic field on the orientation of the B. tabaci adults , females oriented to the main and halfway direction slightly more than males and there was no significant differenes between the four main direction and south east was significantly the most attraction direction halfway. Statistically yellow colour was significantly the most attractive colour. 
Supervisor : dr.Layla Owdah Alshareef 
Thesis Type : Master Thesis 
Publishing Year : 1431 AH
2010 AD 
Added Date : Saturday, March 13, 2010 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
رجاء عبدالله الزهرانيAL-Zahrani, Rajaa AbdullahResearcher  

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 25908.pdf pdf 

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