scholarly journals Factors affecting colonization and abundance of Aphis gossypii glover (hemiptera: aphididae) on okra plantations

2007 ◽  
Vol 31 (2) ◽  
pp. 337-343 ◽  
Author(s):  
Germano Leão Demolin Leite ◽  
Marcelo Picanço ◽  
José Cola Zanuncio ◽  
Marcos Rafael Gusmão
Keyword(s):  
Organic Compounds ◽  
Natural Enemies ◽  
Aphis Gossypii ◽  
Leaf Nitrogen ◽  
Aphid Population ◽  
Mortality Factors ◽  
Total Rainfall ◽  
Bottom Part ◽  
Factors Affecting ◽  
Aphis Gossypii Glover

The control of Aphis gossypii Glover (Hemiptera: Aphididae) on okra Abelmoschus esculentus (L.) (Malvaceae) consist primarily in the use of insecticides, due to the lack of information on other mortality factors. The objective of this study was to determine the effects of predators and parasitoids, height of canopy, plant age, leaf areas, organic compounds leaves, levels of leaf nitrogen and potassium, density of leaf trichomes, total rainfall and median temperature on attack intensity of A. gossypii on two successive A. esculentus var. Santa Cruz plantations. Monthly number estimates of A. gossypii and natural enemies (visual inspection) occurred on bottom, middle and apical parts of 30 plants/plantation (one leaf/plant). Plants senescence, leaf areas and natural enemies, mainly Adialytus spp., spiders and Coccinellidae, were some of the factors that most contributed to aphid reduction. A higher number of aphids was found on the bottom part than medium and apical parts of okra plants. Total rainfall can reduce the aphid population. Trichomes non-glandular or low density, organic compounds leaves and levels of N and K were not important for reducing aphid population.

scholarly journals Factors affecting herbivory of Thrips palmi (Thysanoptera: Thripidae) and Aphis gossypii (Homoptera: Aphididae) on the eggplant (Solanum melongena)

2006 ◽  
Vol 49 (3) ◽  
pp. 361-369 ◽  
Author(s):  
Germano Leão Demolin Leite ◽  
Marcelo Picanço ◽  
José Cola Zanuncio ◽  
Carvalho Carlos Ecole
Keyword(s):  
Natural Enemies ◽  
Aphis Gossypii ◽  
Solanum Melongena ◽  
Total Rainfall ◽  
Factors Affecting ◽  
Mean Temperature ◽  
Thrips Palmi ◽  
Aphis Gossypii Glover ◽  
Attack Intensity ◽  
Aphid Populations

The objective of this study was to evaluate effects of total rainfall, mean temperature, natural enemies, chemical composition of leaves, levels of nitrogen and potassium on leaves and density of leaf trichomes on attack intensity of Thrips palmi Karny (Thysanoptera: Thripidae) and Aphis gossypii (Glover) (Homoptera: Aphididae) on plantations of the eggplant (Solanum melongena) in two regions of Minas Gerais, Brazil. Higher numbers of A. gossypii/leaf and T. palmi/leaf were observed in plantations of this eggplant in the Municipalities of Viçosa and Guidoval, respectively. Guidoval had a rainy and hotter weather than Viçosa. T. palmi was almost positivelly correlated with rainfall (r= 0.49, P= 0.0538) while A. gossypii seemed to be more affected by mean temperature (r= -0.31; P= 0.1134). Higher number of aphids in eggplants in Viçosa than in Guidoval could be explained by the higher number of natural enemies such as Adialytus spp. (Hymenoptera: Braconidae), Cycloneda sanguinea (L.) and Exochomus bimaculosus Mulsant (Coleoptera: Coccinellidae) and Chrysoperla spp. (Neuroptera: Chrysopidae) in this municipality. However, only Adialytus spp. was significativelly correlated with aphid populations. Higher number of T. palmi in eggplant plantations of Guidoval than in Viçosa could be due to the absence of its possible Eulophidae parasitoid in the first municipality. The spiders were significativelly correlated with this pest in both municipalities.

scholarly journals Whitefly population dynamics in okra plantations

2005 ◽  
Vol 40 (1) ◽  
pp. 19-25 ◽  
Author(s):  
Germano Leão Demolin Leite ◽  
Marcelo Picanço ◽  
Gulab Newandram Jham ◽  
Márcio Dionízio Moreira
Keyword(s):  
Population Dynamics ◽  
Visual Inspection ◽  
Leaf Nitrogen ◽  
Trichome Density ◽  
Mortality Factors ◽  
Total Rainfall ◽  
Bottom Part ◽  
Lack Of Information ◽  
Insect Migration ◽  
Biotype B

The control of whitefly Bemisia tabaci (Gennadius) biotype B (Hemiptera: Aleyrodidae) on okra (Abelmoschus esculentus L.) consists primarily in the use of insecticides, due to the lack of information on other mortality factors. The objective of this study was to evaluate the spatial and temporal population dynamics of the whitefly B. tabaci biotype B on two successive A. esculentus var. "Santa Cruz" plantations. Leaf chemical composition, leaf nitrogen and potassium contents, trichome density, canopy height, plant age, predators, parasitoids, total rainfall and median temperature were evaluated and their relationships with whitefly on okra were determined. Monthly number estimates of whitefly adults, nymphs (visual inspection) and eggs (magnifying lens) occurred on bottom, middle and apical parts of 30 plants/plantation (one leaf/plant). Plants senescence and natural enemies, mainly Encarsia sp., Chrysoperla spp. and Coccinellidae, were some of the factors that most contributed to whitefly reduction. The second okra plantation, 50 m apart from the first, was strongly attacked by whitefly, probably because of the insect migration from the first to the second plantation. No significant effects of the plant canopy on whitefly eggs and adults distribution were found. A higher number of whitefly nymphs was found on the medium part than on the bottom part.

scholarly journals Whitefly, aphids and thrips attack on cabbage

2006 ◽  
Vol 41 (10) ◽  
pp. 1469-1475 ◽  
Author(s):  
Germano Leão Demolin Leite ◽  
Marcelo Picanço ◽  
Gulab Newandram Jham ◽  
Márcio Dionízio Moreira
Keyword(s):  
Chemical Composition ◽  
Relative Humidity ◽  
Natural Enemies ◽  
Leaf Nitrogen ◽  
Significant Relation ◽  
Total Rainfall ◽  
Leaf N Content ◽  
Cheiracanthium Inclusum ◽  
Thrips Population ◽  
Leaf N

The objective of this work was to investigate the relationships between predators and parasitoids, leaf chemical composition, levels of leaf nitrogen and potassium, total rainfall, relative humidity, daylight and median temperature on the intensity of whitefly, aphid, and thrips attack on cabbage. Whitefly, aphids and thrips population tended to proliferate in the final stage of plant or reached a peak population about 40 days after plantation. The whitefly and thrips tended to increase with an increase in the median temperature. A dependence of Cheiracanthium inclusum and Adialytus spp. populations on whitefly and aphids populations, respectively, was observed. No significant effect was detected between K and nonacosane leaf content and aphid population. However, an increase in leaf N content was followed by a decrease of this insect population. No significant relation was observed between leaf N, K and nonacosane and whitefly and thrips populations. Highest nonacosane levels were observed in plants 40 days after transplant, and relative humidity correlated negatively with nonacosane. Natural enemies, especially the parasitoid Adialytus spp. and the spiders can be useful controlling agents of the whitefly and aphids in cabbage. Median temperature can increase whitefly and thrips populations.

scholarly journals Effect of planting date on the incidence of eggplant aphid, Aphis gossypii Glover and yield of eggplant

2012 ◽  
Vol 39 (2) ◽  
pp. 187-194
Author(s):  
M. Matiur Rahman ◽  
Pankoj Kumar Sarker ◽  
Bidhan Chandra Das
Keyword(s):  
Aphis Gossypii ◽  
Planting Date ◽  
Aphid Population ◽  
Planting Dates ◽  
Plant Yield ◽  
Late Planting ◽  
Aphis Gossypii Glover ◽  
Crops Yield

Impact of planting dates on Aphis gossypii Glover infestation and yields of eggplants was studied in the field. The aphid population was very low (4.75-31.05 aphids/plant) on the first planted crops. Yield of first planting dates were higher (1.56-3.58 kg/plant), however; aphid population on the successive late planting crops gradually increased and reached to peaks at third planting dates (15.51- 96.46 aphids/plant). Yield of eggplant gradually decreased on successive late planting crops and lowest yield recorded for third planting crops (1.06-1.88 kg/plant).DOI: http://dx.doi.org/10.3329/bjz.v39i2.10585 Bangladesh J. Zool. 39(2): 187-194, 2011   

Influence of agro-ecological service crop termination and synthetic biodegradable film covering on Aphis gossypii Glover (Rhynchota: Aphididae) infestation and natural enemy dynamics

2017 ◽  
Vol 33 (4) ◽  
pp. 386-392 ◽  
Author(s):  
Serena Magagnoli ◽  
Laura Depalo ◽  
Antonio Masetti ◽  
Gabriele Campanelli ◽  
Stefano Canali ◽  
...  
Keyword(s):  
Natural Enemies ◽  
Positive Impact ◽  
Nitrogen Concentration ◽  
Aphis Gossypii ◽  
Growing Season ◽  
Leaf Nitrogen ◽  
Biodegradable Film ◽  
Aphid Infestation ◽  
Growing Seasons ◽  
Ecological Service

AbstractAgro-ecological service crops (ASC) can increase the vegetation complexity of agroecosystems leading to a positive impact on natural enemies of arthropod pests and on weed control. In this study, two ASC terminations (green manure and roller crimper) and a Mater-Bi-mulched control (MB) were compared in order to describe the effects on pests and beneficial dynamics in an organic vegetable system. The trials were conducted over two consecutive growing seasons in 2014 and 2015. Zucchini were grown as cash crop and barley as ASC. Pests and natural enemies were monitored fortnightly by visual samplings along the whole zucchini-growing season. Zucchini plants showed a faster vegetative growth in MB treatment than in ASC terminations. In both years, MB plots were characterized by higher soil temperature and higher leaf nitrogen concentration resulting in plants more susceptible to Aphis gossypii infestations. In all the experimental plots, natural enemies controlled aphid infestations and no insecticide and sprays were necessary. In conclusion, the tested ASC techniques have been suggested as a tool to mitigate aphid infestation.

scholarly journals Factors affecting the attack rate of Bemisia tabaci on cucumber

2006 ◽  
Vol 41 (8) ◽  
pp. 1241-1245 ◽  
Author(s):  
Germano Leão Demolin Leite ◽  
Marcelo Picanço ◽  
Raul Narciso Carvalho Guedes ◽  
Carvalho Carlos Ecole
Keyword(s):  
Bemisia Tabaci ◽  
Apical Part ◽  
Leaf Nitrogen ◽  
Pest Species ◽  
Bottom Part ◽  
Foliar Nitrogen ◽  
Factors Affecting ◽  
Biotype B ◽  
Bemisia Tabaci Biotype B ◽  
Attack Intensity

The objective of this work was to determine the effects of rainfall, temperature, predators, parasitoids, plant age, leaf chemical composition, levels of leaf nitrogen and potassium, besides density of leaf trichomes, on attack intensity of Bemisia tabaci biotype B on the Cucumis sativus. An increase in the number of whitefly adults and nymphs per leaf was observed with plant aging. A higher number of whitefly adults per leaf and eggs cm-2 was verified in the apical part than in the middle and bottom part of the plants canopy. However, the higher number of whitefly nymphs was observed in the mid-part than in the apical and bottom part of the plant canopy. The incidence of whitefly nymphs was negatively affected with foliar nitrogen. Pentacosane and octacosane positively affected whitefly adults and the first compound also affected the nymphs of this pest species.

scholarly journals Sulfoxaflor Applied via Drip Irrigation Effectively Controls Cotton Aphid (Aphis gossypii Glover)

Insects ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 345 ◽  
Author(s):  
Jiang ◽  
Wu ◽  
Chen ◽  
Tian ◽  
Zhang ◽  
...  
Keyword(s):  
Natural Enemies ◽  
Drip Irrigation ◽  
Aphis Gossypii ◽  
Control Period ◽  
Foliar Spray ◽  
Effective Control ◽  
Cotton Aphid ◽  
Aphis Gossypii Glover ◽  
Major Pest ◽  
The Cost

Aphis gossypii Glover is a major pest of cotton and can severely affect cotton yield and lint quality. In this study, the efficacy of sulfoxaflor applied via drip irrigation and foliar spray on controlling cotton aphids was evaluated in 2016 and 2017 in Xinjiang, China. The distribution of sulfoxaflor in cotton roots, stems, leaves, and aphids, as well as its effects on two natural enemies of aphids, were also investigated. Results showed that sulfoxaflor applied through drip irrigation mainly concentrated in leaves and provided effective control of cotton aphids for 40 days, compared to 20 days when applied through foliar spray. Furthermore, drip application resulted in much lower sulfoxaflor concentrations in aphids than foliar spray. As a result, ladybird beetle and lacewing populations were higher in drip applied plants than in foliar sprayed plants. Additionally, the cost of drip irrigation was lower than foliar spray as cotton plants are commonly irrigated via drip irrigation in Xinjiang. Our results showed that application of sulfoxaflor through drip irrigation is an effective way of controlling cotton aphids in Xinjiang due to a prolonged control period, safety to two natural enemies, and lower cost of application.

An Evaluation of the Parasitoid, Aphidius colemani Viereck (Hymenoptera: Braconidae) and the Predator Aphidoletes aphidimyza Rondani (Diptera: Cecidomyiidae) for Biological Control of Aphis gossypii Glover (Homoptera: Aphididae) on Cucumber

1997 ◽  
Vol 32 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Vili Harizanova ◽  
Barbara Ekbom
Keyword(s):  
Biological Control ◽  
Natural Enemies ◽  
Aphis Gossypii ◽  
Developmental Time ◽  
Average Lifetime ◽  
Aphidoletes Aphidimyza ◽  
Aphidius Colemani ◽  
Lifetime Fecundity ◽  
Control Programs ◽  
Aphis Gossypii Glover

Developmental time and fecundity of Aphidius colemani Viereck and Aphidoletes aphidimyza Rondani were studied under laboratory conditions on cucumber plants infested with Aphis gossypii Glover at a constant temperature of 20° C, photoperiod of 18 hours and 70% R. H. Developmental time from egg to adult for A. colemani lasted 13.9 days and for A. aphidimyza, from egg to larva was 3 days, larva to pupa 5.8 days, from pupa to adult 11.9 days, and total developmental time was 20.6 days. The average lifetime fecundity was 57.7 for A. colemani and 55.07 for A. aphidimyza. The variation for both species was considerable. Percentage of females for A. colemani was 58% and for A. aphidimyza 66%. One larva of A. aphidimyza will, on average, kill 23.8 A. gossypii during its life. Predation of parasitized aphids by A. aphidimyza was observed. Production of parasitoids was lower when the predator was present. The use of the two natural enemies together in control programs against A. gossypii is discussed.

Sign in / Sign up

Export Citation Format

Share Document