PJB-2024-287
STUDY THE RESISTANCE OF WHEAT GENOTYPES AGAINST BIRD CHERRY OAT APHID (RHOPALOSIPHUM PADI)
Asad Khan
Abstract
STUDY THE RESISTANCE OF WHEAT GENOTYPES AGAINST BIRD CHERRY OAT APHID (RHOPALOSIPHUM PADI)
Asad Khan and Bashir Ahmad
Department of Plant Protection
The University of Agriculture,
Peshawar, Pakistan
January, 2024
ABSTRACT
A study on the categories of resistance in selected wheat genotypes against wheat aphid (Rhopalosiphum padi) was conducted in the field as well as under laboratory conditions at Agriculture Research Institute (ARI) Tarnab, Peshawar, Pakistan during, 2021-2022. During this study, three different experiments were carried out; population trend of aphids, antixenosis and tolerance test in twelve wheat advanced lines. Aphid population was first recorded on January 28, 2022, increased in a normal curve with a peak during Fabruary and afterwards decreased and lowest populations were once again recorded on all tested wheat genotypes towards the end of cropping season. The standard variety, PS-13 and advanced line TRB-14-116 attracted lowest number of aphids (1.24 per plant and 1.38 per plant respectively), while highest was recorded on TRB-02-103 (5.86 aphids per plant). Further, minimum wheat aphids were recorded on 28th January (0.44 aphid per plant) and maximum on 19th February (7.33 aphid per plant). Among the associated natural enemies of R. padi, maximum population of lady bird beetles, green lace wings and syrphid flies were recorded on wheat advanced line TRB-02-103 (2.55, 1.75 and 1.75 per plant), while minimum on wheat genotype PS-13 (0.69, 0.33 and 0.38 per plant) and TRB-14-116 (0.87, 0.30 and 0.48 per plant) respectively. In Antixenosis experiment, the advanced line ‘TRB-14-116’ proved resistant (antixenosis) against aphids with lowest mean number of 1.38 aphid leaf-1 with non-significant difference from standard PS-13 (1.24 aphid leaf-1). The wheat advanced line ‘TRB-02-103’ attracted maximum aphids (5.86 aphid leaf-1) and hence proved susceptible. In tolerance test of the selected advanced lines against R. padi based on proportional plant dry weight change (DWT) and tolerance index (TI), results showed that selected wheat advanced lines ‘TRB-32-123’ and ‘TRB-14-116’ showed reasonable tolerance with more number of aphids population buildup, however showed vigor against wheat aphid and no symptoms of damage were observed. Thus in our current study wheat advanced line “TRB-14-116” proved antixenosis resistant to R. padi while ‘TRB-32-123, and “TRB-14-116” partially tolerance resistant to R. padi and recommended for future screening program as standard and also for the wheat growers.
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