Studies on the Seasonal Occurrence of Insect Pests of Jasmine, Jasminum sambac Linn (original) (raw)

Abstract

Jasmine is one of the important ornamental flower crop widely cultivated and venerate for its attractive fragrant flowers, belonging to the family Oleaceae. Jasmine plant and flower are affected by various insects, mites, diseases and nematodes which pose serious threat to jasmine cultivation. A study was taken up on seasonal pattern and occurrence of insect pests of jasmine in farmer's field at Tiruchirappalli district Tamil Nadu during 2019-2020. During the study around 30 insect species was recorded form the jasmine ecosystem both pest as well as natural enemies. Among them, Budworm, Hendicasis duplifascialis (Hampson), Blossom midge, Contarinia maculipennis (felt), Leaf webworm, Nausinoe geometralis (Guenee) and Red spider mite, Tetranychus urticae (Koch) were found to cause major damage to the jasmine buds and leaves. Out of these insects midge was recorded with maximum incidence during second fortnight of August (34.05 % Infested buds) followed by November second and November first fortnights. Occurrence of Midge are positively correlated with maximum temperature (r = 0.159), minimum temperature (r = 0.505), morning RH (r = 0.006), evening RH (r = 0.142), evaporation (r = 0.143) and rainfall (r = 0.203). Whereas, the population was negatively correlated with wind velocity (r =-0.074) and sunshine hours (r =-0.017). The multiple linear regression equation fitted with weather parameter was Y=-411+4.02MT+3.58mt+1.73RH 1 + 1.05RH 2-5.28 WV-0.81 SS hrs+ 7.77Evapo-0.97 RF. Maximum incidence of budworm was recorded during first fortnight of November (16.26 % Infested buds) followed by October first and August first fortnights. Maximum incidence of leaf webworm was recorded during second fortnight of December (2.2 webs / plant) followed by January first and December first fortnights. The mite population was seen during October first (5.33 mites/leaf) and August second fortnights.

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