Abstract

DEZA-DEZA, Gabriela  and  PINNA-CABREJOS, Jorge. Chlorophyl contents in avocat leaves with different populational levels of Oligonychus punicae Hirst and its impact on yield. rev.udcaactual.divulg.cient. [online]. 2023, vol.26, n.2, e2370.  Epub Dec 19, 2023. ISSN 0123-4226.  https://doi.org/10.31910/rudca.v26.n2.2023.2370.

Avocado is a very important crop worldwide, and in Peru, being a relevant pest the mite Oligonychus punicae. The aim of this paper was to determine the effect of different levels of O. punicae populations on the chlorophyll content in avocado leaves and its impact on their yield, and to infer an economic and intervention threshold. A completely randomized design was carried out, there were 3 treatments each with a different population level corresponding to grades 2, 3 and greater than 3. A tree was taken as a sampling unit with 20 replications per treatment, the mite population was evaluated in 4 leaves per tree. These evaluations were carried out on a weekly basis throughout the campaign. The chlorophyll content of the 4 leaves per tree was evaluated in each treatment, likewise the production in each treatment (t ha-1) was also evaluated. The results showed that the different degrees of infestation studied: Grade 2 (1 - 10 mites / leaf), Grade 3 (11-25 mites / leaf), Grade 4 (26- 50 mites / leaf) and Grade 5 (greater than 50 mites / leaf) of O. Hirst did not influence the chlorophyll indices in the avocado leaves. It was also determined that there is no correlation between the different degrees of infestation of O. punicae Hirst with the avocado yield. In the present work, the mite action threshold could not yet be determined since the population levels studied did not show a statistically significant impact on yield performance.

Keywords : Action threshold; Avocado; Insect pest assessment; Mites; Population ecology.

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