Study of the effect of nutritional elements of different palm cultivars on the population of Ommatissus lybicus (Hem. Tropiduchidae)

Articles in Press

Document Type : Agricultural Entomology

Authors

1 faculty member of Agri- Entomology Research Department, Iranian Research Institute of Plant Protection

2 2- Plant Protection Research Department, Hormozgan Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization (AREEO)

3 Jahrom Agricultural and Natural Resources Research Station, Fars Agricultural and Natural Resources Research Center, AREEO, Shiraz, Iran.

4 Plant Protection Research Department, Kerman Agricultural and Natural Resources Research and Education Center, AREEO, Kerman, Iran.

10.22092/jaep.2025.367444.1530

Abstract

Ommatissus lybicus is a key pest of Iranian groves. This study aimed to evaluate the effect of different date palm cultivars on O.lybicus population. The experiment was carried out in a RCB design with 3treatments and 4replications in three provinces in 2022. Bio2(0.3%EC,1.25ml/L) was spraying on canopy when the second and third instars of nymphs emerged in the winter generation. Nymphs and honeydew droplets were counted before and 14days after spraying. The percentage of calcium, nitrogen, potassium, crude fiber, and sugar were measured in date leaves. The cultivars were divided into different groups by complete clustering method analysis. The results showed that there were significant differences between cultivars, and it had an effect on the nymph and honeydew droplets. So that the highest number of nymphs(82) and honeydew droplets were observed on the Shahani cultivar(145). Also, the effect of Bio2 spraying was different on cultivars. Classification of different cultivars based on the measured values of various parameters in the leaves showed that they were placed in six distinct groups. A highly significant negative correlation (one day before(-0.947) and 14days after spraying(0.910)) was different between cultivars and mean of nymphs. A significant negative correlation(-0.714) was between weight of leaves and the cultivars. Among the examined parameters, crude fiber of leaflets was the most effective variable(R2=0.70) in the population of nymph with a negative correlation(-29.72). The results of this study, while emphasizing the role of various elements of date leaflets on the O.lybicus population, can help in selecting cultivars against this pest.

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Main Subjects

Applied Entomology and Phytopathology

Articles in Press, Corrected Proof
Available Online from 17 March 2025

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