CORRELATION AMONG DAMAGES CAUSED BY YELLOW BEETLE, CLIMATOLOGICAL ELEMENTS AND PRODUCTION OF GUAVA ACCESSES GROWN IN ORGANIC SYSTEM

Juliana Altafin Galli,Marcos Doniseti Michelotto,Maria Beatriz Bernardes Soares,Ivan Herman Fischer,Antônio Lucio Mello Martins

doi:10.1590/0100-29452017987

Juliana Altafin Galli, Marcos Doniseti Michelotto + Show 3 more

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https://doi.org/10.1590/0100-29452017987

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Abstract

ABSTRACT The objective of this research was evaluate the damage caused by the yellow beetle on 85 guava accessions and correlations of the damage with the climatological elements and the production of fruit in an orchard of guava conducted in organic system. Ten leaves by access were analyzed containing the injury of insect attack. Each leaf had its foliar area measured by leaf area meter and, after obtaining the total area, the leaf was covered with duct tape, and measure again. The averages were compared by Scott-Knott test at 5% probability. The 15 accessions with highest average damage had the data submitted to the correlation with the minimum and maximum temperature, precipitation and relative humidity. The production was obtained by the number of fruits/plant. The damages are negatively correlated with the mean relative humidity of 7:00h (local time) in the period of 14 days prior to the assessments, and negatively affect production. The accessions Saito, L4P16, Monte Alto Comum 1 and L5P19 are promising in organic agriculture, for presenting good production and minor damage to insect attack, when compared to others.

Highlights

The guava tree (Psidium guajava L.) (Myr taceae), native from the American tropics is an important fruit in tropical and subtropical regions of the world (SINGH e PAL, 2008)
The yellow beetle Costalimaita ferruginea (Fabr., 1801) (Coleoptera: Chrysomelidae) which is considered on important defoliation pest on Myrtacea, with eminence of the attacks on Eucalyptus (PINTO et al, 2004), composes the insect fauna of guava trees whose adults feed on the leaves, leaving with tracery aspect
The objectives of this study were to evaluate the damage caused by C. ferruginea in accesses of guava cultivated in organic system and study the possible correlations among the insect and the meteorological factors: temperature, precipitation and relative humidity, besides fruit yield

Summary

Introduction

The guava tree (Psidium guajava L.) (Myr taceae), native from the American tropics is an important fruit in tropical and subtropical regions of the world (SINGH e PAL, 2008). The yellow beetle Costalimaita ferruginea (Fabr., 1801) (Coleoptera: Chrysomelidae) which is considered on important defoliation pest on Myrtacea, with eminence of the attacks on Eucalyptus (PINTO et al, 2004), composes the insect fauna of guava trees whose adults feed on the leaves, leaving with tracery aspect. Their larvae present in the soil feed the roots compromising mainly the installation of new orchards (SOUZA FILHO e COSTA, 2009)

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