Development and Fecundity of Aphis Gossypii Glover (Homoptera: Aphididae) on Three Malvaceae Hosts

Authors : Serdar SATAR, Ulrich KERSTING, Nedim UYGUN

Pages : 637-644

View : 16 | Download : 5

Publication Date : 1999-11-01

Article Type : Research Paper

Abstract :Aphis gossypii Glover insert ignore into journalissuearticles values(Homoptera, Aphididae); obtained from cotton fields near Adana in the east Mediterranean region of Turkey were colonized on Gossypium hirsutumL. 'Çukurova 1518' in a climatic room. The effect of host transfer from cotton to common mallow, Malva sylvestris L., and okra, Abelmoschus esculentus insert ignore into journalissuearticles values(L.); Moench `Bamya 501`, on performance of A. gossypii was studied at constant 25 ± 1°C, 60 ± 5 % relative humidity and 16 h of artificial light insert ignore into journalissuearticles values(5000 lux); in temperature cabinets. Three subsequent generations of A. gossypii from cotton were additionally tested on okra. Fecundity tables were constructed to compare the performance of the cotton aphid on the three different Malvaceae hosts. Developmental time insert ignore into journalissuearticles values(6.0 days); was longer and fecundity reduced insert ignore into journalissuearticles values(4.5 nymphs/aphid); on okra compared to common mallow insert ignore into journalissuearticles values(5.6 days and 62.8 nymphs/aphid); and cotton insert ignore into journalissuearticles values(5.5 days and 37.9 nymphs/aphid);. The highest age-specific number of nymphs insert ignore into journalissuearticles values(mx); occurred on common mallow at an age of nine days with 6.8 nymphs/aphid, and the lowest on okra with only 1.2 nymphs/aphid at the ninth day. A. gossypii on cotton produced a maximum age-specific number of nymphs at day ten with 3.4 nymphs/aphid. Generation times insert ignore into journalissuearticles values(TO); were similar for all three host plants, however, the mean number of aphids laid during an individual's lifetime insert ignore into journalissuearticles values(Ro); varied largely between 4.2 aphids/aphid on okra to 65.7 nymphs/aphid on common mallow. The significantly lowest intrinsic rate of increase insert ignore into journalissuearticles values(rm); insert ignore into journalissuearticles values(0.129 aphids/aphid/day); was calculated for A. gossypii on okra. Even after three subsequent generations on okra, the performance did not improve, indicating that genetically distinct host races exist in A. gossypii. On common mallow an rmvalue of 0.397 aphids/aphid/day occurred, whilst on cotton the intrinsic rate of increase was significantly lower with 0.338 aphids/aphid/day.
Keywords : Turk J Agric For, 23, 1999, , 637 644 Turk J Agric For, vol 23, iss 6