Insect pest spectrum on ajwain, Trachyspermum ammi L. genotypes under eastern dry zone of Karnataka

Abstract

An experiment was conducted with fourteen ajwain genotypes at the Department of Plantation, Spices, Medicinal and Aromatic Crops, College of Horticulture, GKVK, Bengaluru, from October 2019 to April 2020 to document insect pest spectrum infesting ajwain. Out of the four insect pests recorded to invade ajwain, three are new pest records on ajwain except aphids. Only the aphid could differentiate the ajwain genotypes and rest three failed to do so due low pest pressure. Irrespective of genotypes, the mean pest population was 2.23 defoliators per plant (Thysanoplusia orichalcea and Archips sp. together), 4.98 per cent stem fly infestation which caused 1.73 per cent plant mortality per 3.8 m 2 plot and 61.85 aphids per 5 cm apical shoot. Aphid population was significantly least on genotype, Lam Sel-1 (43.37) and AA-2 (51.43) and was maximum on DAC-8 (71.90) which indicates scope for exploring the variability for aphid in crop improvement programme.

Correlation and path coefficient analysis in yield and yield related components of Ajwain (Trachyspermum ammi L.) genotypes under Eastern dry zone of Karnataka

“…Negative link of days to maturity with seed yield per plant is due to sudden increase in the temperature which led to sucking pest (aphids) infestation on the crop during the investigation. The reports of Ranjeetha et al (2020 and 2021) [21,22] in ajwain genotypes, Ghanshyam et al (2015) [10] and Faravani et al (2018) [8] in ajwain genotypes/ accessions, Kassaun et al (2013) [14] , Jain et al (2013) [13] , Patahk et al (2014) [17] and Meena et ~ 508 ~ al. (2014) [18] in coriander accessions, Singh et al (2016) [25] and Gurjar et al (2016) [12] in fenugreek genotypes and Bahraminejad et al (2011) [2] in cumin ecotypes supports the present findings.…”

A comprehensive review on ajwain (Trachyspermum ammi L.) cultivation practices

“…The incidece of ployphagous semi looper, Thysanoplusia orichalcea (Fabricius); the tortrix moth, Archips sp. and stem fly is the first record on ajwain in a field experiment at Eastern dry zone of India (Ranjeetha et al, 2020) [42] . The mean pest population was 2.23 defoliators per plant (Thysanoplusia orichalcea and Archips sp.…”

“…The mean pest population was 2.23 defoliators per plant (Thysanoplusia orichalcea and Archips sp. together), 4.98 per cent stem fly infestation resulting in 1.73 per cent plant mortality per 3.8 m 2 plot and the aphid population was 61.85 aphids per 5 cm apical shoot (Ranjeetha et al, 2020) [42] .…”