Biological aspects of Aphis gossypii Glöver, 1877 (Hemiptera: Aphididae) on colored lint cotton cultivars

Abstract

This paper outlines the results of a study into the biological aspects of Aphis gossypii Glöver on colored cotton cultivars through the construction of life tables. In addition, we evaluate the influence of density of gossypol glands and trichomes of leaves on the biology of the aphid. Tests were conducted in a climate chamber at 25 ± 2°C, with relative humidity (RH) at 70 ± 10%, and a photophase of 12 hours, using the cultivars BRS Rubi, BRS Safira, and BRS Verde. Newly hatched nymphs were individually isolated in petri dishes containing leaf discs of cotton cultivars on a layer of water-agar (1%) of approximately 5 mm thick. An evaluation of the trichomes and gossypol gland densities of the cotton leaf plants was performed under a stereomicroscope, delimited to an area of 1 cm², and a count and identification of those on the surface was made. The feed substrates that were evaluated influenced the nymphal stage of A. gossypii. BRS Verde provided the shortest duration and BRS Safira was the longest during this phase. The cultivar BRS Verde, with the lowest density of trichomes, provided a large number of nymphs and led to a higher net reproductive rate (R0). Given these results, conclusions can be drawn that the colored cotton cultivars influence the duration of nymphal and adult stages of A. gossypii. The cultivar with a high density of trichomes on leaves (BRS Safira) adversely affects the fertility parameters of A. gossypii.

Resistance and tolerance of ten carrot cultivars to the hawthorn-carrot aphid, Dysaphis crataegi Kalt., in Poland

“…Having stated that, there is some uncertainty regarding the influence of trichomes on host selection by aphids. It has been reported that trichomes did not affect the selection of host or the biology of the cotton aphid, Aphis gossypii Glöver on cotton [ 67 ], and the cowpea aphid, Aphis craccivora C.L. Koch on cowpea [ 68 ], and on lima bean [ 69 ].…”

Categories of resistance in cotton genotypes, Gossypium spp. against cotton-melon aphid, Aphis gossypii (Hemiptera: Aphididae)

“…Given the importance of aphids as a major cotton pest and the need for developing durable cotton aphid management technology, HPR remains a unique and frontline approach. However, research on screening cotton genotypes for aphid resistance remains sparse (Weathersbee and Hardee 1994, Razmjou et al 2006a, 2006b, Zarpas et al 2006, Furtado et al 2009, Correa et al 2013, Morando et al 2021). Despite all of the breakthroughs made in insect pest management tactics, conventional breeding-based development of insect-resistant crops is still regarded as the most effective way and the foundation for insect pest management programs (Marimuthu and Smith 2012, Smith 2021).…”