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The tingid bug, Dictyla cheriani (Drake) [Hemiptera: Tingidae] is animportant pest of Indian cherry (Cordia myxa L.), leading to significant lossesin yield in the hot arid agro-climate of India. The objectives of this study wereto identify and categorize sources of resistance in India cherry accessions toD. cheriani from the arid region of India. We found that: three accessionswere resistant; 3 accessions were moderately resistant; 2 accessions weremoderately susceptible; 2 accessions weresusceptible and three accessionswere highly susceptible to D. cheriani infestation. Free amino acid had positive correlation with infestation, whereas phenols, tannin, alkaloid andflavonoid contents had significant negative correlation with infestation. Theinfestation had significant negative correlation with leaf length and width.Phenols and flavonoid contents explained (96.9 and 96.1%, respectively) ofthe total variation in bug infestation and in bug density per leaf. One principalcomponent was extracted explaining cumulative variation of 90.07% ininfestation. The flavonoid, alkaloid, tannins, phenols content, roughness andhairyness were the novel antibiosis and antixenotic characters found in Indiancherry accessions, which were resistant to D. cheriani. Growers can adoptpotential accessions of Indian cherry (Cordia myxa L.) asidentified forresistance (AHCM-22-1, AHCM-25 and AHCM-34 accessions) with minimalfinancial investment for obtaining higher yields. The bio-physical traits linkedto resistance of Indian cherry against D. cheriani could be used as marker traits in plant breeding programmes to develop resistant cultivars. |
