Diagrammatical scale to quantify herbivory severity on feijoa leaf caused by<i> Paraulaca dives </i>(Coleoptera: Chrysomelidae)

CARMONA, GILBERTO C.C.; ANDRADE, GILBERTO S.; CITADIN, IDEMIR; ROHR, ANGELA; SACHET, MARCOS R.; DONAZZOLO, JOEL; CAMPOS, JOSÉ R.R.; DANNER, MOESES A.

doi:10.1590/0001-3765202320200759

Brasil

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CROP SCIENCE • An. Acad. Bras. Ciênc. 95 (2) • 2023 • https://doi.org/10.1590/0001-3765202320200759 linkcopy

Diagrammatical scale to quantify herbivory severity on feijoa leaf caused by Paraulaca dives (Coleoptera: Chrysomelidae)

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Abstract

The aims of this work were to characterize the damage caused by Paraulaca dives in feijoa (Acca sellowiana) and develop a diagrammatic scale to evaluate the severity of herbivory. The evaluations were carried out in a feijoa progenies orchard with eight-year-old. The beetles caused damage mainly on leaves, from October to December (spring season). The distribution of beetles in the orchard occurred randomly, not following a defined pattern of incidence. The diagrammatic scale of herbivory severity was represented by seven levels (1%, 3%, 5%, 7%, 15%, 32%, and 55% of the leaf area consumed). The use of this diagrammatic scale significantly increased the precision and accuracy of severity estimates by inexperienced evaluators. This can help in strategies to control this pest to expand the cultivation of feijoa in Brazil.

Key words Acca sellowiana; insect herbivory; pest georeferencing; population fluctuation

Statistics	With SAD	Without SAD	MD	CI (95%)
r	0.922 (0.028)	0.883 (0.042)	0.04 (0.058)	-0.002 to 0.08^ns
C _b	0.996 (0.003)	0.812 (0.057)	0.185 (0.058)	0.144 to 0.225*
u	-0.032 (0.055)	0.497 (0.056)	-0.529 (0.084)	-0.587 to -0.471*
υ	0.966 (0.052)	1.583 (0.211)	-0.617 (0.182)	-0.743 to -0.491*
ρ _c	0.919 (0.027)	0.716 (0.057)	0.203 (0.056)	0.164 to 0.242*
SDD	11.575 (1.942)	18.606 (3.633)	-7.031 (3.038)	-9.137 to -4.926*

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[tfnI] Means and standard error of mean in parenthesis (n = 8 raters). r: correlation coefficient between estimated and real severity (i.e. precision); C_b: a correction factor that measures how far away the adjusted line is in relation to concordant line (i.e. accuracy); u: difference between the line of regression and concordant line; υ: difference in the inclination between regression and concordant lines; ρ_c: Lin`s concordant correlation coefficient. SDD: Small detectable difference; MD: Mean Difference between each evaluation with mean standard error in parenthesis. CI: Confidence interval at 95% probability. Interval including zero, the difference is not significant (^ns), unlike, the difference is significant (*).