Impact of jute yellow mite, Polyphagotarsonemus latus (Banks) density on hosts (Corchorus olitorius L.) phenology and assessment of yield loss under field condition

Abstract : Jute yellow mite, Polyphagotarsonemus latus (Banks) (Acari: Tarsonemidae) is one of the destructive pests of jute, which has been expanded in recent years in Bangladesh. Jute plants of tossa (Corchorus olitorius L.) varieties were considered as treatments viz., O-9897, O-72, OM-1 and O-795. The paired plot treatments (miticide treated and miticide untreated cintrol) were laid out under field condition. The yellow mite impact was studied on three stages of jute plants: 60 DAS (day after sowing), 90 DAS and 120 DAS. The higher number of mite stages observed upto 90 DAS then declined afterward upto 120 DAS in var. OM-1 among four C. olitorius varieties. A damage index scale (0-5) was to assess yellow mite injury to jute plants. The percent infestation and damage index was also used to relate yellow mite injury to different yield contributing characters of plants infested at three different phenological stages. The yield contributing characters of untreated plots showed significant damage at 60, 90 and 120 DAS in C. olitorius varieties compared to treatment plots. The highest fibre yield losses due to mite infestation was found in the variety OM-1 (77.93%) followed by O-795 (75.40%), O-72 (69.59%) and the lowest was in O-9897 (69.35%); the highest stick yield losses was in the variety OM-1(75.56%) followed by O-795 (71.44%) and O-72 (65.87%), the lowest was in O-9897 (65.75%) and the highest seed yield losses was in the variety O-795 (49.08%) followed by OM-1 (47.46%) and O-72 (39.10%), the lowest was in O-9897 (29.94%) under field condition. High yellow mite population in the untreated check decreased plant growth and showed significant yield loss in the variety OM-1
Keyword : Polyphagotarsonemus latus, Corchorus olitorius, incidence, yield loss
Author(s) : , A. S. M. Kamruzzaman, M. Z. Alam, M. R. U. Miah
Downloads : 1114

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