Oulbachir Karima

• Biodiversity Journal, 11 (4): 1031-1036

  Labdelli Fatiha, Bousmaha Fatma, Adamou Djerbaoui Malika, Bouchenafa Nadia, Oulbachir Karima & Laouidj Aicha
  Impact of Nematode Heterodera avenae Wollenwebwer, 1924 (Heteroderidae) attack on cereal yields in the region of Tiaret (Algeria)
  https://doi.org/10.31396/Biodiv.Jour.2020.11.4.1031.1036

  ABSTRACT
  The cyst nematode Heterodera avenae Wollenweber, 1924 (Heteroderidae) is an obligate endoparasite of grasses. It is the most studied and most damaging nematode known for more than a century. The study of the distribution of the H. avenae cyst nematode was carried out on some plots of cereal-oriented municipalities in the Tiaret region to assess the infestation levels of the plots in order to study the impact of the nematode infestation on cereal yields. Spearman’s test was used, which allowed us to study the correlation between the degree of infestation and cereal yields, particularly wheat, barley and oats. The plots of the communes surveyed are all infested by H. avenae with different levels of infestation except the plots of the town of Sebaine and Mahdia where the infestation is practically non-existent (0 cysts/100 g of soil). The correlation is negative between the degree of infestation and the yield (r = -0.06), the yields of hard wheat are low when the degree of infestation is high. Soft wheat and barley yields are negatively correlated with respectively, r = - 0.26 and r = -0.27, therefore, heavy infestations of the nematode lead to a decrease in yield. Unlike other cereal species, the correlation is positive with the degree of infestation (r = 0.18), so the infestation of the nematode did not greatly influence oat yields. Oats are a tolerant species for nematode attack in relation to wheat and barley that have recorded decreases in yields. Unlike the three previous crop types, oats stand out for their tolerance to this parasite.

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