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FIELD INFESTATION OF CARYEDON SERRATUS OLIVIER [COLEOPTERA: BRUCHIDAE] ON THE PODS AND SEEDS OF ACACIA NILOTICA IN THE THAR DESERT OF INDIA

Satya Vir and S.K. Jindal
Journal of Tropical Forest Science
Vol. 9, No. 2 (December 1996), pp. 189-193
Stable URL: http://www.jstor.org/stable/23616369
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
FIELD INFESTATION OF CARYEDON SERRATUS OLIVIER [COLEOPTERA: BRUCHIDAE] ON THE PODS AND SEEDS OF ACACIA NILOTICA IN THE THAR DESERT OF INDIA
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Abstract

Caryedon serratus Olivier has been recorded as a serious pest on pods and seeds of Acacia nilotica in the Thar desert of India. Pest infestation on developing pods and its relationship with morphological traits is reported. Bruchid infestation was recorded in April and the insect continued to multiply in the field as the pods remained on the tree when ripe. Infestation of pods varied from 10 to 30 % with 1.2 to 1.8 % infestation of seeds. Insect infestation resulted in a loss of 22.51% in seed weight and 1.18% loss in seed biomass of the tree. Infestation of pods was directly related to infestation of seed (r = 0.81**). Infestation of seed was directly correlated with loss in seed weight (r = 0.83**) and loss in seed biomass from the tree (r = 0.76*). The insect remained in the field during the hottest months of May and June and was also reported to infest pods and seeds of Prosopis cineraria and P. juliflora. These trees thus act as the secondary host, for population buildup of C. serratus, from where it spreads to its primary host, the groundnut, Arachis hypogea, which is becoming a common crop of this region with the introduction of the Indira Gandhi Canal in the Thar desert. Caryedon serratus Olivier telah direkodkan sebagai serangan perosak yang serius ke atas lenggai dan biji benih Acacia nilotica di padang pasir Thar, India. Serangan serangga ke atas lenggai yang sedang membesar dan kaitannya dengan sifat-sifat morfologinya telah dilaporkan. Serangan bruchid telah direkodkan pada bulan April dan serangga ini terus bertambah di lapangan sementara lenggai terus berada pada pokok apabila masak. Serangan ke atas lenggai berkisar antara 10 hingga 30% dengan 1.2 hingga 1.8 serangan ke atas biji benih. Serangan serangga menyebabkan kehilangan berat biji benih sebanyak 22 - 51% dan kehilangan biojisim biji benih pokok tersebut sebanyak 1.18%. Serangan ke atas lenggai berkaitan secara langsung dengan serangan ke atas biji benih (r = 0.81**). Serangan biji benih (r = 0.83**) dan kehilangan biojisim biji benih daripada pokok (r = 0.76*). Serangga terus berada di lapangan pada musimmusim paling panas pada bulan Mei dan Jun. Ia dilaporkan juga menyerang lenggai dan biji benih Prosopis cineraria dan P. juliflora. Pokok-pokok ini bertindak sebagai perumah sekunder, bagi perkembangan populasi C. serratus dari mana ia tersebar kepada perumah utama, iaitu kacang tanah, Arachis hypogea, yang merupakan tanaman utama di rantau ini dengan pembinaan Terusan Indira Gandhi di gurun Thar.

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