Resistance to thrips (Enneothrips flavens) in wild and amphidiploid Arachis species

Thrips (Enneothrips flavens) is a pest that causes severe damage and yield losses to peanut crop if not properly controlled. The main control method currently used by farmers is bi-weekly application of insecticides during crop development, which, in addition to its toxicity, is very costly. Thus, n...

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Bibliographic Details
Published in:PloS one 2017-05, Vol.12 (5), p.e0176811
Main Authors: Michelotto, Marcos Doniseti, de Godoy, Ignácio José, Pirotta, Melina Zacarelli, Dos Santos, João Francisco, Finoto, Everton Luiz, Pereira Fávero, Alessandra
Format: Article
Language:English
Subjects:
Agribusiness
Animals
Arachis
Arachis - genetics
Arachis - physiology
Arachis batizocoi
Arachis cardenasii
Arachis duranensis
Arachis gregoryi
Arachis kempff-mercadoi
Arachis magna
Arachis stenosperma
Arachis vallsii
Arachis williamsii
Biology and Life Sciences
Breeding
Crop development
Crop infestation
Crops
Cultivars
Diploidy
Disease resistance (Plants)
Diseases and pests
Earth Sciences
Enneothrips flavens
Experiments
Infestation
Insecticide resistance
Insecticides
Insects
Peanuts
Pest control
Pesticide resistance
Pests
Physical characteristics
Physiological aspects
Seasons
Seeds
Studies
Thrips
Thysanoptera - physiology
Toxicity
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Summary:Thrips (Enneothrips flavens) is a pest that causes severe damage and yield losses to peanut crop if not properly controlled. The main control method currently used by farmers is bi-weekly application of insecticides during crop development, which, in addition to its toxicity, is very costly. Thus, new sources of resistance must be identified in order to reduce the use of insecticides and effectively manage the pest. This study aimed to evaluate the occurrence and symptoms of E. flavens infestations in 12 accessions of 10 wild species of Arachis and nine amphidiploids, as well as to compare their morphoagronomic characteristics to those of commercial cultivars. To this end, we conducted experiments during two summer seasons, using a randomized block design with four replications. We conducted evaluations of the severity of infestation, noting visual symptoms of E. flavens and morphological and reproductive characteristics of the Arachis plants. Results indicated that wild accessions V 7635 (A. vallsii), V 13250 (A. kempff-mercadoi), K 9484 (A. batizocoi), Wi 1118 (A. williamsii), V 14167 (A. duranensis) and V 13751 (A. magna) are the most promising for obtaining useful new amphidiploids. Among the amphidiploids, An 12 (A. batizocoi x A. kempff-mercadoi)4x, An 9 (A. gregoryi x A. stenosperma) 4x, and An 8 (A. magna x A. cardenasii)4x showed high level of resistance to E. flavens. The identified thrips resistant wild and amphidiploid Arachis species may be used in future breeding program to produce thrips resistant peanut cultivars.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0176811