Comparison of Vertical Cloth and Whole Plant Bag Sampling Methods for Estimating Predator Populations on Cotton
By Muhammad Naveed Arshad on Mar 5, 2019

Crop Protection WCRC WCRC2

ABSTRACT Two monitoring methods, whole plant bag sampling (WPBS) and vertical cloth sampling (VCS) were evaluated for estimating densities of cotton predators. WPBS was used as a standard for comparing the efficiency of the VCS. Sampling of predators was carried out at the Agriculture Experiment Station in Reconquista, Santa Fe Argentina, in 1998...

Sampling Techniques for the Evaluation of Aphis gossypii Glover (Homoptera: Aphididae) Infestation in Cotton
By Muhammad Naveed Arshad on Mar 5, 2019

Crop Protection WCRC WCRC2

ABSTRACT In the search for a sampling technique to get better accuracy and lower cost in assessing aphid infestation in cotton crops, weekly systematic random sampling was undertaken in two 50 ha fields in 1995/96. The number of aphids per plant, the proportion of plants attacked during the crop cycle and number of aphids in the top six nodes betw...

New Spray Adjuvant Increases the Efficacy of Cotton Insecticides
By Muhammad Naveed Arshad on Mar 5, 2019

Crop Protection WCRC WCRC2

ABSTRACT Vicchem EOP was evaluated with several insecticides for control of crickets and aphids. In laboratory studies, EOP enhanced the efficacy of betacyfluthrin and deltamethrin three-fold against crickets compared to dimethoate and carbaryl. In field studies, EOP increased the activity of imidacloprid on aphids in cotton but no enhancement was...

A New Technology for Improved Pesticide Coverage on Cotton Canopy. Part II: Field Efficacy
By Muhammad Naveed Arshad on Mar 5, 2019

Crop Protection WCRC WCRC2

ABSTRACT Whitefly (Bemisia argentifolii [Gennadius]), is widespread on cotton in hot, semi-arid areas. Apart from direct yield losses, the honeydew excreta causes stickiness of cotton fibers and enables sooty mould development. Whitefly is also a vector of a number of viral diseases. A major part of its life cycle is as a sessile larva on the unde...

Spatial and Probability Distribution of Aphis gossypii Infestation in West Africa: Application to Non Random Field Sampling
By Muhammad Naveed Arshad on Mar 5, 2019

Crop Protection WCRC WCRC2

ABSTRACT A non-random sampling plan is proposed for monitoring insect infestation in cotton to facilitate spraying, based on action thresholds, to control Aphis gossypii on cotton plants in Central Africa. Non random sampling is preferred to random sampling because it is easier to implement. It is validated by the spatial distribution of the insec...

Bollworm Sampling for Action Thresholds in Sub Saharan Africa: Spatial and Probability Distribution
By Muhammad Naveed Arshad on Mar 5, 2019

Crop Protection WCRC WCRC2

ABSTRACT A diagonal sampling plan is proposed for monitoring insect infestation in cotton to facilitate spraying, based on action thresholds, to control Helicoverpa armigera in sub-Saharan Africa. The spatial distribution of larvae was studied with variograms. The probability distribution was inferred from the relationship between mean and varianc...

A New Technology for Improved Pesticide Coverage on the Cotton Canopy. Part I: Sprayer Development
By Muhammad Naveed Arshad on Mar 5, 2019

Crop Protection WCRC WCRC2

ABSTRACT Insect control in cotton fields should comply with the new demands for reduction of pesticide toxicity and environmental hazard. In order to meet these demands, a new technology capable of delivering very high spray deposition uniformity was developed and tested. Penetration of the spray into the dense cotton canopy was achieved utilizing...

Spatial Distribution of Preimaginal Bemesia tabaci (Homo-ptera: Aleyrodidae) in Cotton
By Muhammad Naveed Arshad on Feb 22, 2019

Crop Protection WCRC WCRC2

ABSTRACT Studies were conducted to examine the distribution of preimaginal Bemesia tabaci (Gennadius) in cotton, Gossypium hirsutum L. at various locations in 1996 and 1997. The number of eggs and nymphs were counted on the underside of leaves from the top, middle and bottom thirds of the plants. Fifty to one hundred leaf samples were taken from e...

Mass Rearing and Use of a New Species of Chrysoperla (NeuropteraL Chrysopidae) in Cotton Crops in Argentina
By Muhammad Naveed Arshad on Feb 22, 2019

Crop Protection WCRC WCRC2

ABSTRACT In the larval stage, Chrysoperla (Steiman) species feed on various agricultural pests. So far, only Chrysoperla externa had been recorded on cotton crops in Argentina. Towards the end of 1994, Chrysoperla chaquensis was discovered in the province of Salta, being predominant in the western region of the Argentinian cotton area, while C. ex...

The Influence of Host Plants on the Mating Success of the Cotton Bollworm,
By Muhammad Naveed Arshad on Feb 22, 2019

Crop Protection WCRC WCRC2

ABSTRACT The chances of a moth mating successfully may depend on the type of crop or other vegetation surrounding it. Mating trays were used to determine the mating success of Helicoverpa armigera (Hübner) in various crops in the Darling Downs, Queensland, Australia during the 1996/97 and 1667/98 seasons. Moth abundance was assessed with pheromone...

Survival and Control of the Boll Weevil, Anthonomus grandis, Around Overwintering Habitat in the United States
By Muhammad Naveed Arshad on Feb 22, 2019

Crop Protection WCRC WCRC2

ABSTRACT A field and a laboratory experiment were performed to evaluate factors that influence the overwinter survival of boll weevil, Anthonomus grandis Boheman, populations. Spring surveys of boll weevil densities were conducted as indicators of overwintering survival in 1994, 1995, 1996 and 1997 in four Arkansas counties. Approximately 1000 tra...

Seasonal Ecology of Deraeocoris pallens (Hemiptera: Miridae) in Cotton
By Muhammad Naveed Arshad on Feb 22, 2019

Crop Protection WCRC WCRC2

ABSTRACT Deraeocoris pallens Reut. is the most commonly observed predator in cotton fields of Çukurova region in Turkey. Population developments D. pallens and other cotton pests were monitored in four different cotton fields in 1992 and 1993. The number of aphids, spider mites, thrips and whiteflies were counted on fifteen cotton leaves randomly...

The Status of Bemesia as a Cotton Pest: Past Trends and Future Possibilities
By Muhammad Naveed Arshad on Feb 21, 2019

Crop Protection WCRC WCRC2

ABSTRACT Bemesia tabaci was first recognized as a cotton pest in India early in the 20th Century. Between 1970 and 1980, severe outbreaks occurred in Sudan, Turkey and Israel, followed by California, on vegetable crops and cotton. In 1989-90, epidemic infestations occurred on cotton in the USA, followed by Mexico and then South America and Asia. T...

Parasitism and Other Mortality in the Cotton Boll Weevil Anthonomus grandis Boh. (Coleoptera:Curculionidae) in Paraguay
By Muhammad Naveed Arshad on Feb 21, 2019

Crop Protection WCRC WCRC2

ABSTRACT Boll weevil (Anthonomus grandis Boh.) parasitism by 2 hymenopterous parasites, tentatively identified as Catolaccus sp. and Bracon sp., was found in the San Pedro province, Paraguay, in 1995-96 to reach astonishingly high levels often killing 100 % of the immature host population. Another key mortality factor was egg non-viability; 27% of...

Movement of Boll Weevils in Three Areas of Texas Relative to Cotton Plant Phenology
By Muhammad Naveed Arshad on Feb 21, 2019

Crop Protection WCRC WCRC2

ABSTRACT This investigation was conducted in three separate areas of Texas using baited traps around cotton fields and in all four directions one mile apart, up to five miles from the test site, to define the movement and mechanism of boll weevil survival during the cotton season. Generally, more boll weevils were captured at sites away from cotto...

Capture of Alabama argillacea Hübner (Lepidoptera: Noctuidae) Adults in Light Traps in Cotton,
By Muhammad Naveed Arshad on Feb 21, 2019

Crop Protection WCRC WCRC2

ABSTRACT In cotton crop management it is important to carry out periodic scouting to evaluate the degree of infestation with lepidopteran pests, which can be captured at the adult stage with light traps and/or specific pheromones. The objective of this study was to try to identify an association between Alabama argillacea adults captured in lig...

Morphophysiological Changes of Cotton under Saline Stress in the Presence of Fusarium oxysporum sp
By Muhammad Naveed Arshad on Feb 21, 2019

Crop Protection WCRC WCRC2

ABSTRACT Fusarium wilt in cotton causes the greatest damage on sandy soil, acid, potassium deficient and saline soils. Because Fusarium wilt is more virulent under saline stress, the morphophysiological variations predisposing cotton plants under saline stress to the disease were evaluated. Seed of two cotton (Gossypium hirsutum L.) cultivars, Cok...

Management of Cotton Leaf Curl Virus Disease in India
By Muhammad Naveed Arshad on Feb 21, 2019

Crop Protection WCRC WCRC2

ABSTRACT Cotton leaf curl viral disease (CLCuV) incidence has increased in northern states of India (Punjab, Haryana and Rajasthan) since 1993. CLCuV reduces the number of harvestable bolls by 15-87 per cent and seed cotton yield by 11-92 per cent, depending on the extent and time of infection. The whitefly (Bemisia tabaci) and inoculum are presen...

Search for Elite Sources of Resistance to Leaf Curl Virus in Upland Cotton
By Muhammad Naveed Arshad on Feb 21, 2019

Crop Protection WCRC WCRC2

ABSTRACT Cotton leaf curl virus (CLCuV) is a serious disease of cotton in the state of Punjab, causing heavy losses in an epiphytotic year. During kharif season (May-November) 1997, 284 entries from different state and co-ordinated trials, and 592 germplasm lines/cultivars were screened against CLCuV at PAU, Regional Research Station, Faridkot and...

Development of Genotypes that are Tolerant to Verticillium Wilt in Iran
By Muhammad Naveed Arshad on Feb 21, 2019

Crop Protection WCRC WCRC2

ABSTRACT Verticillium wilt is a serious disease of cotton in northern Iran. It is favoured by cool air and soil conditions. Control measures include cultural practices and the cultivation of regionally adapted tolerant cultivars but the effectiveness of these measures depends on the that are to the causal strain of the disease and the inoculum lev...