Germplasm evaluation of mango for preference of the mango hopper, Idioscopus nitidulus (Walker) (Hemiptera: Cicadellidae) : The first step in understanding the host plant resistance

S DEVI THANGAM, ABRAHAM VERGHESE, M R DINESH, C VASUGI, P D KAMALA JAYANTHI

Abstract


Mango hopper, Idioscopus nitidulus (Walker) (Hemiptera : Cicadellidae) is a serious pest of mango that breeds
on new  shoots  in September - November and on  inflorescence  in December ñ February. The population  from  the  shoots becomes  the  precursor  to  the population  on mango  inflorescence. So,  preference of  I. nitidulus  to various  accession  of mango germplasm during vegetative shoot stage  is crucial. A study was carried out at  the  Indian  Institute of Horticultural Research, Bangalore, India (120
 8íN; 770  35íE) during two alternate years 2010 and 2012.  Of 392 accessions evaluated, 32 accessions were  identified as  less preferred which  in spite of conducive breeding/feeding niches  for hoppers  (new shoots) showed zero hopper population in both the years. If found validated when challenged with hoppers, these can be utilized by breeders for developing resistant accession. For the moderate to highly susceptible accessions correlation analysis revealed positive  significant  correlation  between  the mean  percentage  shooting  and mean  hopper  population  confirming  their
susceptibility.


Keywords


Feeding preference; germplasm; Idioscopus nitidulus; mango

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