Relationship Between <I>Aphis gossypii</I> (Homoptera: Aphididae) and Sticky Lint in Cotton

Abstract

The study was conducted in the northern Texas Rolling Plains in 1999 to define the relationship between number of cotton aphids, Aphis gossypii Glover, and resulting contamination of cotton lint by honeydew. Whole-plot treatments were three furrow irrigation management treatments: cotton grown without supplemental irrigation (dryland), irrigated cotton with last irrigation in mid August, and irrigated cotton with last irrigation in late August. Subplots within each irrigation treatment included an untreated check, a plot treated with lambda-cyhalothrin to stimulate aphid population increase, a plot treated with lambda-cyhalothrin followed by pymetrozine after aphids began to increase, and a plot treated with lambda-cyhalothrin followed by thiamethoxam after aphids began to increase. Cotton aphids were counted on leaves picked from the top and bottom half of the plant. Cotton lint was analyzed for contamination by glucose, fructose, sucrose, and melezitose secreted by cotton aphids, and percentage leaf moisture and nitrogen and leaf sucrose concentrations were determined. The manual sticky cotton thermodetector was used to determine degree of lint stickinesss. There was a significant relationship between thermodetector counts and melezitose contamination on lint, and a melezitose concentration of 90.9 microg/g of lint was associated with a thermodetector count of 10, the threshold for sticky lint problems in textile mills. An equation was developed to estimate melezitose concentration on lint as a function of average numbers of aphids per leaf and the interaction between percentage leaf moisture and nitrogen. The number of aphids per leaf associated with a melezitose concentration of 90.9 microg/g of lint ranged from 11.1 to 50.1, depending on percentage leaf moisture and nitrogen. The threshold for sticky lint problems occurred when aphid numbers ranged between 11.1 and 50.1 per leaf after bolls open.

Ecological Adaption Analysis of the Cotton Aphid (Aphis gossypii) in Different Phenotypes by Transcriptome Comparison

“…Moreover, high aphid densities later in the cotton season also present risks because they produce copious amounts of honeydew, which blackens the leaf, decreases photosynthetic activity, and contaminates the lint resulting in severely reduced lint quality [2]. In general, there are two cotton aphid breakouts each year, during the seedling of cotton andsummer, and exhibit phenotypic differences due to environmental heterogeneity in China.…”

Performance of cotton aphidAphis gossypii(Hemiptera: Aphididae) lineages on cotton varieties

“…Upland cotton, Gossypium hirsutum L. (Malvaceae), is a cosmopolitan, warm climate crop species, geographically distributed between latitudes 328S and 458N, that is well adapted to the climate of the Mediterranean basin, and it has been one of the most important crops in Greece for many decades (National Statistical Service of Greece 1999). The cotton aphid Aphis gossypii Glover (Hemiptera: Aphididae) is a serious pest of cotton throughout the World, causing severe losses together with significant qualitative degradation (sticky lint) (Rosenheim et al 1997;Deguine et al 2000;Slosser et al 2002). The aphid is extremely polyphagous, infesting over 900 plant species around the world (Blackman and Eastop 2000).…”

ANALISIS KEANEKARAGAMAN COCCINELLIDAE PREDATOR DAN KUTU DAUN (Aphididae spp) PADA EKOSISTEM PERTANAMAN CABAI DI SUMATERA BARAT

“…Pengamatan keanekaragaman dan kelimpahan kutu daun dilakukan pada daun cabai muda sekitar 10 cm dari pucuk tanaman. Pengambilan nimfa atau imago kutu daun hanya dilakukan dengan satu metode yakni koleksi langsung menangkap dengan tangan setiap kutu daun yang ditemukan pada petak sampel dengan mengikuti metode Slosser et al (2002) dan Miao et al (2007) karena kutu daun mobilitasnya sangat rendah.…”