scholarly journals Standardized sampling plan for Aphis gossypii based on the cotton cultivar, plant phenology and crop size

2019 ◽  
Vol 143 (8) ◽  
pp. 893-901 ◽  
Author(s):  
Tamíris A. Araújo ◽  
Lúcia Helena A. Araújo ◽  
Nilson R. Silva ◽  
Carlos Eduardo A. Luz ◽  
Ézio M. da Silva ◽  
...  
Keyword(s):  
Aphis Gossypii ◽  
Plant Phenology ◽  
Sampling Plan ◽  
Crop Size ◽  
Cotton Cultivar

scholarly journals Effects of Citrus Overwintering Predators, Host Plant Phenology and Environmental Variables on Aphid Infestation Dynamics in Clementine Citrus

2019 ◽  
Vol 112 (4) ◽  
pp. 1587-1597 ◽  
Author(s):  
Juan Pedro Raul Bouvet ◽  
Alberto Urbaneja ◽  
César Monzó
Keyword(s):  
Biological Control ◽  
Host Plant ◽  
Natural Enemies ◽  
Environmental Variables ◽  
Aphis Gossypii ◽  
Colony Growth ◽  
Plant Phenology ◽  
Conservation Strategies ◽  
Phenological Stages ◽  
Aphid Infestation

Abstract The Spirea citrus aphid, Aphis spiraecola Patch, and the cotton aphid, Aphis gossypii Glover (Hemiptera: Aphididae), are key pests of clementine mandarines in the Mediterranean basin. Severity of aphid infestations is determined by environmental variables, host plant phenology patterns, and the biological control exerted by their associated natural enemies. However, there is no information about the role these limiting and regulating factors play. Aphid densities, citrus phenology, and associated predators that overwinter in the crop were monitored weekly throughout two flush growth periods (February to July) in four clementine mandarin groves; relationships between these parameters and environmental variables (temperature and precipitation) were studied. Our results show exponential increase in aphid infestation levels to coincide with citrus phenological stages B3 and B4; shoots offer more space and nutritional resources for colony growth at these stages. Duration of these phenological stages, which was mediated by mean temperature, seems to importantly determine the severity of aphid infestations in the groves. Among those studied, the micro-coccinellids, mostly Scymnus species, were the only group of predators with the ability to efficiently regulate aphid populations. These natural enemies had the highest temporal and spatial demographic stability. Aphid regulation success was only achieved through early presence of natural enemies in the grove, at the aphid colonization phase. Our results suggest that conservation strategies aimed at preserving and enhancing Scymnus sp. populations may make an important contribution to the future success of the biological control of these key citrus pests.

Effect of Cotton Cultivar on Performance of Aphis gossypii (Homoptera: Aphididae) in Iran

2006 ◽  
Vol 99 (5) ◽  
pp. 1820-1825 ◽  
Author(s):  
Jabraeil Razmjou ◽  
Saeid Moharramipour ◽  
Yaghoub Fathipour ◽  
Seyed Ziaeddin Mirhoseini
Keyword(s):  
Aphis Gossypii ◽  
Cotton Cultivar

Effect of Cotton Cultivar on Performance of Aphis gossypii (Homoptera: Aphididae) in Iran

2006 ◽  
Vol 99 (5) ◽  
pp. 1820-1825 ◽  
Author(s):  
Jabraeil Razmjou ◽  
Saeid Moharramipour ◽  
Yaghoub Fathipour ◽  
Seyed Ziaeddin Mirhoseini
Keyword(s):  
Aphis Gossypii ◽  
Cotton Cultivar

scholarly journals Within-plant distribution of cotton aphids, Aphis gossypii Glover (Hemiptera: Aphididae), in Bt and non-Bt cotton fields

2011 ◽  
Vol 102 (1) ◽  
pp. 79-87 ◽  
Author(s):  
F.S. Fernandes ◽  
F.S. Ramalho ◽  
J.L. Nascimento ◽  
J.B. Malaquias ◽  
A.R.B. Nascimento ◽  
...  
Keyword(s):  
Decision Making ◽  
Aphis Gossypii ◽  
Temporal Distribution ◽  
Horizontal Distribution ◽  
Plant Distribution ◽  
Bt Cotton ◽  
Transgenic Bt Cotton ◽  
Vertical And Horizontal Distribution ◽  
Over Time ◽  
Cotton Cultivar

AbstractKnowledge of the vertical and horizontal distribution of Aphis gossypii Glover (Hemiptera: Aphididae) on genetically modified cotton plants over time could help optimize decision-making in integrated cotton aphid management programs. Therefore, the aim of the present study was to determine the vertical and horizontal distribution of A. gossypii in non-transgenic Bt cotton and transgenic Bt-cotton over time during two cotton seasons by examining plants throughout the seasons. There was no significant interaction between years and cotton cultivar treatments for apterous or alate aphids. Considering year-to-year data, analyses on season-long averages of apterous or alate aphids showed that aphid densities per plant did not differ among years. The number of apterous aphids found per plant for the Bt transgenic cultivar (2427 apterous aphids per plant) was lower than for its isoline (3335 apterous aphids per plant). The number of alate aphids found per plant on the Bt transgenic cultivar (12.28 alate aphids per plant) was lower than for the isoline (140.56 alate aphids per plant). With regard to the vertical distribution of apterous aphids or alate aphids, there were interactions between cotton cultivar, plant age and plant region. We conclude that in comparison to non-Bt cotton (DP 4049), Bt cotton (DP 404 BG (Bollgard)) has significant effects on the vertical, horizontal, spatial and temporal distribution patterns of A. gossypii, showing changes in its distribution behaviour inside the plant as the cotton crop develops. The results of our study are relevant for understanding the vertical and horizontal distribution of A. gossypii on Bt cotton cultivar (DP 404 BG (Bollgard)) and on its isoline (DP 4049), and could be useful in decision-making, implementing controls and determining the timing of population peaks of this insect.

Comparative Effectiveness Of Seed Treating And Foliar Insecticides Against Sucking Pests Of Cotton And Impact On Their Natural Enemies

2013 ◽  
Vol 38 (1) ◽  
pp. 61-70 ◽  
Author(s):  
SMA Hossain ◽  
MA Baque ◽  
MR Amin
Keyword(s):  
Natural Enemies ◽  
Untreated Control ◽  
Seed Treatment ◽  
Foliar Spray ◽  
Cost Ratio ◽  
Research Station ◽  
Benefit Cost Ratio ◽  
Benefit Cost ◽  
Thrips Population ◽  
Cotton Cultivar

The Imidacloprid insecticide, Gaucho 70 WS at 1.5, 2.5, 3.5, 4.5 and 5.5 g/kg seed was used as seed treatment and monocrotophos 40 WSC at 1120 ml/ha was applied as foliar spray on CB9 cotton cultivar to suppress aphid, whitefly and thrips, and impact on their natural enemies during 2008-2011 at the Regional Cotton Research Station, Dinajpur, Bangladesh. The activity of natural enemies, such as ladybird beetle, lacewing, syrphid, and spider population on the sucking pests attacking cotton cultivar CB9 and yield of cotton were recorded. Imidacloprid significantly reduced aphid, whitefly, and thrips population on cotton crops compared to untreated control or foliar spray of monocrotophos 40 WSC at 1120 ml/ha. Ladybird beetles, lacewings, syrphids, and spiders were abundant in the field but their population decreased in the treated plots compared to untreated control. The CB9 cotton cultivar produced significantly higher yield (1.73 t/ha) with a benefit cost ratio 12.47 when seeds were treated with Imidacloprid at 5.5 g/kg fuzzy seed. This study indicated that Imidacloprid (Gaucho 70 WS) used as a seed treatment may be suggested to the cotton growers for controlling sucking pests. Bangladesh J. Agril. Res. 38(1): 61-70, March 2013 DOI: http://dx.doi.org/10.3329/bjar.v38i1.15190

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