Browsing by Author "Vidyasagar, P.S.P.V."

Now showing 1 - 17 of 17
  • Thumbnail Image
    Item
    Bioecology of coconut whitegrub Leucopholis coneophora Burmeister in Kerala
    (2007-02-08) Chandrika Mohan; Vidyasagar, P.S.P.V.
    Studies were carried out on the ecology, biology and population dynamics of Leucopholis coneophora Burmeister (Coleoptera: Scarabaeidae: Melolonthinae), a key pest of coconut in India. The adult emergence from soil was observed in the field after 4-5 rainy days irrespective of the amount of rainfall, combined with a sudden fall in soil temperature. In the field-collected samples the ratio of female to male was 1:8. Adults of both sexes were also found attracted to light traps in small numbers and their female to male sex ratio was 1:5. Out of several plant species screened in lab cages, the tender leaves of mango (257 mmVday) were preferred over cashew, banana, sapota and coconut. An average fecundity of 23.08 (± 1.985) eggs per female was observed in the lab. The incubation period was 23.94 (± 0.134) days and the I, II and III larval instars were completed in 40, 55 and 175 days respectively followed by the pupal period of 25 days. Feeding potential of III instar larvae has revealed that an average of 1.03g of fresh coconut root/larva was consumed in 24 hours. The phenology of the pest has been investigated and the peak population of the pest was observed in the field during the month of September.
  • Thumbnail Image
    Item
    Bioefficacy of insecticides against white grub Leucopholis lepidophora Blanch infesting arecanut palm
    (2007-02-08) Subaharan, K.; Vidyasagar, P.S.P.V.; Mohammad Basheer, B.M.
    The root infesting scarabaeid white grub Leucopholis lepidophora Blanch is a major pest on arecanut in Western ghats area of Karnataka. In an attempt to identify an insecticide with enhanced bioaction against L. lepidophora four insecticides viz. carbosulfan tefluthrin chlorpyriphos and phorate (standard insecticide) were screened for their toxicity in the laboratory and in the field. In laboratory bioassay studies, the order of toxicity observed was carbosulfan > tefluthrin > chlorpyriphos > phorate. On relative toxicity, carbosulfan was 4.2 times more toxic as compared to phorate followed by tefluthrin (2.8) and chlorpyriphos (1.9) in the case of II instar grubs. In III instar nubs carbosulfan was 13 times more toxic than phorate whereas, tefluthrin and chlorpyriphos were 12.5 and 2.7 times more toxic than phorate, respectively. A replicated field trial was taken up at arecanut gardens in Sringeri 1(Kamataka) for two years and the treatments were imposed during post monsoon season (1999 and 2000). Carbosulfan [ @ 20 g / palm during first and second years effected a mean reduction in grub population to a tune of 80.6 % and 66 I % , respectively. Chlorpyriphos @ 8 ml/ palm and carbosulfan @ 10 g / palm caused > 60 % reduction in grub population during both the years of study. The standard insecticide phorate @ 10 g / palm caused a mean reduction of ; 36.43% and 44% during the respective years.
  • Thumbnail Image
    Item
    Biology and control of Rattus rattus wroughtonii Hinton, a pest of coconut in India
    (1993) Keshava Bhat, S.; Vidyasagar, P.S.P.V.; Sujatha, A.
  • Thumbnail Image
    Item
    Eriophyid mites on coconut and their management
    (2007-02) Vidyasagar, P.S.P.V.
  • Thumbnail Image
    Item
    Impact of Mass Pheromone Trapping on Red Palm Weevil: Adult Population and Infestation Level in Date Palm Gardens of Saudi Arabia
    (2000) Vidyasagar, P.S.P.V.; Mohammed Hagi; Abozuhairah, R.A.; Omer E. Al Mohanna; Ali A. Al Saihati
  • Thumbnail Image
    Item
    International Directory of Coconut Workers
    (2007-02) Rajagopal, V.; Vidyasagar, P.S.P.V.; Viraktamath, B.C.; Solomon, J.J.
  • Thumbnail Image
    Item
    Investigaion on tendernut drop in arecanut
    (Central Plantaion Crops Research Institute, Regional Station Vittal, 1999) Chandra Mohanan, R.; Vidyasagar, P.S.P.V.; Mariamma Daniel
  • Thumbnail Image
    Item
    Management of Red Palm Weevil Rhynchophorus Ferrugineus Oliv., A Serious Pest of Date Palm in Al Qatif, Kingdom of Saudi Arabia
    (2000) Vidyasagar, P.S.P.V.; Ali A. Al Saihati; Omer E. Al Mohanna; Ali I. Subbei; Abdul Mohsin, A.M.
    The red palm weevil, Rhynchophorus ferrugineus Oliv, is the most serious pest of date palm in the Arabian Peninsula. As the control of the pest was not effective with any single control method, an integrated management system was developed and implemented in the most seriously affected Al Qatif region of Saudi Arabia. The methods of control included the survey of all the cultivated gardens in the region, systematic checking of all palms for infestation, periodic soaking of palms in cultivated gardens and mass removal of neglected farms. Regular survey was conducted in about 3,055 gardens with a total of 4,64,785 palms. Infestation was brought down from 6.6% in the year 1993 to around 2.5% in 1997, with proper implementation of the management practices. There has been an increase in mild infestation and decrease in severely infested palms. The weevil population in the region had also been reduced considerably after the use of mass pheromone trapping system. A total of 4,09,109 palms in neglected farms were eradicated with heavy machinery to eliminate the breeding places for the weevil. All these methods have contributed to the successful implementation of a comprehensive integrated management system in the region.
  • Thumbnail Image
    Item
    Pest Management in Coconut Gardens
    (2007-02) Vidyasagar, P.S.P.V.; Keshava Bhat, S.
    The coconut palm, Cocos nucifera L. is attacked by nearly 57 species of insects and 12 species of rodents and other vertebrates in India. Among them the rhinoceros beetle, Oryctes rhinoceros L., the leaf eating caterpillar, Opisina arenosella Meyr., the red palm weevil, Rhynchophorus ferrugineus F., the white grub, Leucopholis coneophora Burm., and the black rat, Rattus rattus L. are considered to be the major pests. The nature of damage and severity of infestation are discussed. A review has been made on the control aspects including cultural, mechanical, chemical, physiological and biological methods adopted against these pests. An account of the damage and control of other less important pests such as scales, mealy bugs, nut crinklers, termites and bandicoots are also discussed.
  • Thumbnail Image
    Item
    Problems and Prospects of Growing Vegetables as Intercrops in Coconut Garden
    (2007-02) Hegde, M.R.; Mohd. Yusuf; Vidyasagar, P.S.P.V.
  • Thumbnail Image
    Item
    Record of rattus rattus wroughtoni as a pest of oil palm seedlings
    (1990) Keshava Bhat, S.; Vidyasagar, P.S.P.V.; Sujatha, A.
  • Thumbnail Image
    Item
    Record of Wax Scale Ceroplastes Floridensis Comstock (Homoptera: Coccidae) Infesting Clove Seedlings In Kerala, India
    (1989) Vidyasagar, P.S.P.V.; Abdulla Koya, K.M.; Devasahayam, S.; Prem Kumar, T.
    Ceroplastes fioridensis Comstock (Hemoptera : Coccidae) has been recordef for the first time infesting clove seedlings in Kerala, India
  • Thumbnail Image
    Item
  • Thumbnail Image
    Item
    A Sampling Technique To Estimate White Grub Population In Coconut Garden
    (1997) Chandrika Mohan; Vidyasagar, P.S.P.V.; Vijayakumar, K.
    A sampling technique was standardised for the population estimation of Leucopholis coenophora around the palm basin in irrigated coconut gardens. The total number of white grubs present in the root zone of a palm can be estimated by the regression equation Y = 3.78 + 1.7938 x, where Y is the total population of white grubs found around a palm and x is the number of insect stages found upto a depth of 40 cm at a distance of 50 to 100 cm away from the trunk of the palm.
  • Thumbnail Image
    Item
    Sexing Live Adults of the Pollu Beetle Longitarsus Nigripennis Mots. (Chrysomelidae: Coleoptera)
    (1988) Vidyasagar, P.S.P.V.; Devasahayam, S.; Abdulla Koya, K.M.
  • Thumbnail Image
    Item
    Studies for colour-selection of Rhynchophorus ferrugineus pheromone trap
    (2014-12) Mahmoud M. Abdel-Azim; Rashid M. Khan; Saleh A. Aldosari; Vidyasagar, P.S.P.V.; Samy M. Ibrahim; Paraj Shukla
  • Thumbnail Image
    Item
    Studies On Halyomorpha Marmorea F. (Pentatomidae:Heteroptera), Associated With Tender Nut Drop In Arecanut.
    (1991) Vidyasagar, P.S.P.V.
    The biology of pentatomid bug Halyomorphia marmorea F. which causes tender nut drop in arecanut has been studied. The investigations were conducted during poist-monsoon seasons of 1985 and 1986. Under laboratory conditions, the female and male bugs lived for 38.0 and 33.8 days, respectively. Fe-males laid, on an average, 4 egg clusters, each comprising 28 eggs. The incubation period varied from 4-6 days with an average of 5.1 days. There were five nymphal instars each with an average duration of 3.7, 6.1, 5.1, 6.5 and 9.3 days, respectively. The description of different instars is furnished in detail. The nature and extent of damage to arecanut and host range of this pentatomid bug are also discussed.