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Changes in photosynthetic and transpiration rates of cotton leaves infested with the cotton aphid, Aphis gossypii : Unrestricted infestation
Author(s) -
SHANNAG HAIL KAMEL,
THORVILSON HARLAN,
ELSHATNAWI MOH'D KHAIR
Publication year - 1998
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1998.tb05181.x
Subject(s) - aphis gossypii , biology , aphid , transpiration , infestation , population , photosynthesis , agronomy , aphis , horticulture , botany , aphididae , homoptera , pest analysis , demography , sociology
Summary The influence of aphid, Aphis gossypii , feeding on photosynthesis and transpiration in cotton plants was investigated under greenhouse conditions. Four population densities of 0, 5, 10, and 25 aphids were used to infest individual cotton leaves. Gas exchange rates were determined for single attached cotton leaves after 9, 18, and 27 days of aphid infestation. Aphid feeding changed photosynthetic rates and transpiration rates. These changes were proportional to the number of aphids and the length of infestation period. Photosynthetic rates were significantly reduced in infested leaves with 25 aphids over 18 days, whereas significant reduction in photosynthetic rates was recorded within 27 days in infested leaves with 5, 10, and 25 aphids in comparison to their respective control. Initial population of 10 aphids increased significantly the transpiration rate of infested leaves over 9 and 27 days. Leaves of plants with 25 aphids had significantly greater transpiration rate than the control at all times.