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Amalendu Ghosh,Amrita Das,Ruben Lepcha,Kaushik Majumdar,V.K. Baranwal 한국응용곤충학회 2015 Journal of Asia-Pacific Entomology Vol.18 No.3
Darjeeling hills and Dooars of West Bengal (India) are well known for production of mandarin orange and lime. Citrus tristeza virus (CTV) is wide spread in this region. Role of insect vectors in spreading CTV in this region has not been studied so far. Therefore, a study on identification of insect vectors along with their temporal and spatial distributionwas undertaken. Five aphid species were identified fromcitrus orchards of Darjeeling and Dooars viz. Toxoptera citricida, T. aurantii, Aphis gossypii, Myzus persicae and Brachycaudus helichrysi. T. citricida was found predominant in the orchards of lower altitude and was responsible for maximum spread of CTV. T. aurantii was dominant in the citrus orchards at high altitude (N500 m). Incidence of CTV was higher in the orchards where T. citricida was present either alone or with other species. Under caged conditions, T. citricida was more efficient to transmit CTV than the other aphid species. Occurrences of all aphid species were highly influenced by the advent of new flushes.
ON THE CLOSED EINSTEIN-WEYL STRUCTURE AND COMPACT K-CONTACT MANIFOLD
Ghosh, Amalendu Korean Mathematical Society 2016 대한수학회보 Vol.53 No.6
We study closed Einstein-Weyl structure on compact K-contact manifolds and prove that a compact K-contact manifold admitting a closed Einstein-Weyl structure is Einstein and Sasakian.
On the closed Einstein-Weyl structure and compact $K$-contact manifold
Amalendu Ghosh 대한수학회 2016 대한수학회보 Vol.53 No.6
We study closed Einstein-Weyl structure on compact $K$-con\-tact manifolds and prove that a compact $K$-contact manifold admitting a closed Einstein-Weyl structure is Einstein and Sasakian.
The $k$-almost Ricci solitons and contact geometry
Amalendu Ghosh,Dhriti Sundar Patra 대한수학회 2018 대한수학회지 Vol.55 No.1
The aim of this article is to study the $k$-almost Ricci soliton and $k$-almost gradient Ricci soliton on contact metric manifold. First, we prove that if a compact $K$-contact metric is a $k$-almost gradient Ricci soliton, then it is isometric to a unit sphere $S^{2n+1}$. Next, we extend this result on a compact $k$-almost Ricci soliton when the flow vector field $X$ is contact. Finally, we study some special types of $k$-almost Ricci solitons where the potential vector field $X$ is point wise collinear with the Reeb vector field $\xi$ of the contact metric structure.
THE k-ALMOST RICCI SOLITONS AND CONTACT GEOMETRY
Ghosh, Amalendu,Patra, Dhriti Sundar Korean Mathematical Society 2018 대한수학회지 Vol.55 No.1
The aim of this article is to study the k-almost Ricci soliton and k-almost gradient Ricci soliton on contact metric manifold. First, we prove that if a compact K-contact metric is a k-almost gradient Ricci soliton, then it is isometric to a unit sphere $S^{2n+1}$. Next, we extend this result on a compact k-almost Ricci soliton when the flow vector field X is contact. Finally, we study some special types of k-almost Ricci solitons where the potential vector field X is point wise collinear with the Reeb vector field ${\xi}$ of the contact metric structure.
Jangra Sumit,Dhall Heena,Aggarwal Shilpi,Mandal Bikash,Jain Rakesh Kumar,Ghosh Amalendu 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.2
Thrips palmi is an important insect pest of vegetables and ornamental crops worldwide. Besides direct damage caused by feeding, it transmits several tospoviruses in a persistent-propagative manner. Eggs of T. palmi are microscopic and embedded within plant tissue by the sharp ovipositor of adult female. In the present study, an artificial oviposition setup has been standardized for T. palmi. Eggs of T. palmi were harvested in sterile water between two thin membranes. The developmental stages of T. palmi embryo were studied starting from oviposition up to hatching by inverted and confocal reflection microscopy. Energids were homogeneously distributed at an early stage of development. The anterior end of the egg curved with a constriction post 38 h. Initiation of tissue organization, mouthparts, appendages, compound eyes were observed at different time points. Appendages were well developed and segmentation was prominent post 70 h. The embryo was completely developed at around 80 h and hatched by 86 h post oviposition at 28 °C temperature. The study first time reports the embryonic development of T. palmi that would be helpful in detailed investigations of thrips developmental biology and evolution.