Posts
The Status of Bemesia as a Cotton Pest: Past Trends and Future Possibilities
By
Muhammad Naveed Arshad
on
Feb 21, 2019
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
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
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
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
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
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
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
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...
Fusarium Wilt of Cotton in Australia
By
Muhammad Naveed Arshad
on
Feb 21, 2019
ABSTRACT Fusarium wilt of cotton caused by the fungus Fusarium oxysporum Schletend. f.sp. vasinfectum (Atk.) Snyder and Hansen (Fov) was first recorded in Australia in 1993. Several hundred isolates of Fov have since been examined in laboratory and glasshouse studies to determine the range of genetic and pathogenic diversity in the Australian Fov...
Development of Verticillium dahliae in Cotton Plants Grown in Cukurova and Reaction of Some Cultivars to Wilt
By
Muhammad Naveed Arshad
on
Feb 15, 2019
ABSTRACT Seven cotton cultivars were inoculated with Verticillium dahliae Kleb. using a spore suspension of 2.5x106 conidia/ml by the stem puncture technique. Infection development of symptoms on plants inoculated with T-1 and SS-4 strains were investigated until the 25th day after inoculation. Strain T-1 reached 15 cm above the inoculation point...
Fusarium Wilt Disease Manifestation in Cotton Fields of Tanzania
By
Muhammad Naveed Arshad
on
Feb 15, 2019
ABSTRACT Investigations were conducted in Tanzania to assess factors affecting rapid spread of Fusarium wilt disease in cotton fields. The main areas of this study were the Mara and Mwanza regions where this Fusarium wilt disease is becoming increasingly important. Fusarium wilt disease is caused by Fusarium oxysporum f.sp. vasinfectum. Interviews...
Interactions of Fusarium and Verticillium Wilt with Root-Knot Nematodes in Cotton
By
Muhammad Naveed Arshad
on
Feb 15, 2019
ABSTRACT The association between root-knot nematode (RKN) and Fusarium wilt of cotton has been known since the 19th century but the effect of RKN infection on the Verticillium wilt has not been widely investigated. Two pot experiments were conducted to study the levels of interaction of each fungal species with RKN. Each pot (11x11x12 cm) had thre...
Etiology, Incidence and Prevelance of Cotton Wilt Disease and Strains of Wilt Pathogen in Cukurova
By
Muhammad Naveed Arshad
on
Feb 15, 2019
ABSTRACT Wilt disease surveys in 164 cotton fields of Cukurova indicated that the disease was present in 11 fields in 1994 and 12 in 1995. Verticillium dahliae Kleb. was isolated from diseased plants. Cultural and morphological characters indicated that the fungus produced erect, verticillate conidiophores and ellipsoid, one-celled, 3-5x1.2-3.1m...
Agrobacterium Bronzing and Wilt of Cotton: Epidemiology and Control
By
Muhammad Naveed Arshad
on
Feb 15, 2019
ABSTRACT Bronzing and sudden wilt syndrome that develops in USA cotton plants during boll development in hot weather have been associated with infections of roots by Agrobacterium biovar 1 strains. Conditions favouring the multiplication of the bacteria in roots and development of symptoms include: high clay content in soil, high soil temperatures...
The Development of New Strains of Verticillium dahliae in Australia
By
Muhammad Naveed Arshad
on
Feb 15, 2019
ABSTRACT Verticillium wilt was once the most widespread and significant disease of cotton in Australia. Several cultivars with some resistance to the disease have been released by CSIRO since 1989. These cultivars have been widely adopted and grown repeatedly. The results of annual disease surveys and field experiments have shown that repeated cul...
Cotton Leaf Curl Virus: A Threat to Pakistan Cotton
By
Muhammad Naveed Arshad
on
Feb 15, 2019
ABSTRACT Spread of cotton leaf curl virus (CLCuV) in cotton growing areas of Punjab cause immense losses in cotton production in Pakistan. It appeared in epidemic form in 1998, but became serious from 1992-93. Studies to combat this problem centres around the characterization of virus, its vector (whitefly), alternate host and the causative enviro...
Distribution of Heliothine Larvae in Bt and Non-Bt Cotton in Texas
By
Muhammad Naveed Arshad
on
Feb 14, 2019
ABSTRACT Knowledge of population dynamics in heliothines in transgenic cotton is needed to develop resistance management strategy and scouting guidelines. The spatial distribution of heliothine larvae within and among transgenic cotton plants is likely to be influenced by variation in toxin expression within individual plants and throughout the gr...
Chlorguard Plus: New Insecticide Combination Product Effective Against Cotton Bollworm, Helicoverpa armigera (Hb.)
By
Muhammad Naveed Arshad
on
Feb 14, 2019
ABSTRACT Studies undertaken to manage bollworm, Helicoverpa armigera Hübner in irrigated cotton in Raichur, India over three seasons, indicate some benefits of using certain insecticide mixtures. These benefits included an overall reduction in sucking pests and reduced damage by H. armigera. Resistance of H. armigera was lower to mixtures than to...
Okra-Leaf and Normal Leaf Cotton Resistance to Silverleaf Whitefly
By
Muhammad Naveed Arshad
on
Feb 14, 2019
ABSTRACT Okra-leaf and normal leaf upland cotton cultivars and experimental breeding-lines were evaluated for susceptibility to silverleaf whitefly, Bemisia argentifolii Bellows and Perring and cotton leaf crumple disease caused by cotton leaf crumple geminivirus (CLCV). In March 1997, 16 cotton cultivars and breeding-lines were sown into a random...
Cotton Insect Pest Control with Indoxacarb
By
Muhammad Naveed Arshad
on
Feb 14, 2019
ABSTRACT The cotton insect pest spectrum is dominated by the orders Lepidoptera and Homoptera. The status of different pests and control measures on cotton is dynamic and varies with geography and pest complex. Indoxacarb, a new broad-spectrum Lepidoptera control agent with some activity against Homoptera (e.g. Empoasca spp.), has a unique mode of...