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Subject: Entomology × Author: Hitendra Kumar × End date: 2017 × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Identification of new sources of resistance and evaluation of some IPM modules against major insect pests of rice
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2008-01) Hitendra Kumar; Tiwari, S.N.
    New sources of resistance were identified in rice against brown plant hopper in 865 entries of AICRIP, 2005 and 2006, in 205 entries of IRRI and 24 rice varieties in glasshouse screening tests. Entries NDR 3110, PTB 33 and CR 2069-16-1 were found immune against BPH, while KAUM MO 8 20 KR, CRAc 34997, KRH 2, HKR 01-44, IR 1218-598-1-281-1, R 1243-1224-578-1, IR 71033-62-15, REMYA (MO. 10), IR 55548-5, IR 57257-34-1-2-1, IR 59547-247-2-1, IR 59552-63-3-2-3 and one rice variety Manhar were rated as highly resistant. Under field evaluation test against BPH all the entries of different AICRIP and IRRI trials were found highly resistant, resistant and moderately resistant due to low BPH incidence during both kharif 2005 and 2006, except cv Manhar, which was found moderately susceptible In field screening of different entries of AICRIP and IRRI against yellow stem borer, immune reaction was exhibited by 31 entries at vegetative stage and by 76 entries at reproductive stage. Under glasshouse conditions 17 entries of IRSBN-05 exhibited immune reaction against yellow stem borer. All the entries tested for resistance to leaf folder under field condition were found with less per cent leaf damage due to low incidence of leaf folder during both kharif 2005 and 2006. Growth and development of brown plant hopper nymphs and honey dew excretion by brown plant hopper adults was significantly low on different highly resistant, resistant and moderately resistant entries as compared to susceptible TN 1. Longevity of both male and female adults of BPH on highly resistant, resistant and moderately resistant entries was significantly high than TN 1. F1 progenies of all the seven crosses of rice entries were at par in their resistance reaction against BPH with their resistant female parents under glass house conditions, while F1 progenies of REMYA (MO. 10) × Pusa Basmati 1 and IR 59552-63-2-3 × Pusa Basmati 1 were superior over other progenies in their resistance to brown plant hopper. Among different IPM modules evaluated at farmers field for the management of yellow stem borer, module IV devoid of any control measure due to low pest pressure gave high benefit cost ratio as compared to other modules during both kharif 2005 and 2006. Only Telenomus sp. was found to parasitize the yellow stem borer eggs at all the three locations viz. Pantnagar, Kashipur and Pratppur during both kharif 2005 and 2006. Maximum activities of Telenomus sp. was recorded in second week of September, while minimum was in third week of September.
  • Thumbnail Image
    ThesisItemOpen Access
    Identification of new sources of resistance and evaluation of some IPM modules against major insect pests of rice
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2008-01) Hitendra Kumar; Tiwari, S.N.
    New sources of resistance were identified in rice against brown plant hopper in 865 entries of AICRIP, 2005 and 2006, in 205 entries of IRRI and 24 rice varieties in glasshouse screening tests. Entries NDR 3110, PTB 33 and CR 2069-16-1 were found immune against BPH, while KAUM MO 8 20 KR, CRAc 34997, KRH 2, HKR 01-44, IR 1218-598-1-281-1, R 1243-1224-578-1, IR 71033-62-15, REMYA (MO. 10), IR 55548-5, IR 57257-34-1-2-1, IR 59547-247-2-1, IR 59552-63-3-2-3 and one rice variety Manhar were rated as highly resistant. Under field evaluation test against BPH all the entries of different AICRIP and IRRI trials were found highly resistant, resistant and moderately resistant due to low BPH incidence during both kharif 2005 and 2006, except cv Manhar, which was found moderately susceptible. In field screening of different entries of AICRIP and IRRI against yellow stem borer, immune reaction was exhibited by 31 entries at vegetative stage and by 76 entries at reproductive stage. Under glasshouse conditions 17 entries of IRSBN-05 exhibited immune reaction against yellow stem borer. All the entries tested for resistance to leaf folder under field condition were found with less per cent leaf damage due to low incidence of leaf folder during both kharif 2005 and 2006. Growth and development of brown plant hopper nymphs and honey dew excretion by brown plant hopper adults was significantly low on different highly resistant, resistant and moderately resistant entries as compared to susceptible TN 1. Longevity of both male and female adults of BPH on highly resistant, resistant and moderately resistant entries was significantly high than TN 1. F1 progenies of all the seven crosses of rice entries were at par in their resistance reaction against BPH with their resistant female parents under glass house conditions, while F1 progenies of REMYA (MO. 10) × Pusa Basmati 1 and IR 59552-63-2-3 × Pusa Basmati 1 were superior over other progenies in their resistance to brown plant hopper. Among different IPM modules evaluated at farmer’s field for the management of yellow stem borer, module IV devoid of any control measure due to low pest pressure gave high benefit cost ratio as compared to other modules during both kharif 2005 and 2006. Only Telenomus sp. was found to parasitize the yellow stem borer eggs at all the three locations viz. Pantnagar, Kashipur and Pratppur during both kharif 2005 and 2006. A maximum activity of Telenomus sp. was recorded in second week of September, while minimum was in third week of September.