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Plant-Mediated Interaction : A First Record of Thrips Feeding on Hartigiola annulipes (Diptera: Cecidomyiidae) Galls

Pilichowski Sebastian, Ulitzka Manfred R., Jagiełło Radosław, Giertych Marian J.

Polish Journal of Ecology

2019

Vol. 67, nr 2

168--173

Galls formed by insects can act as sinks for nutrients and attract other herbivores to feed on gall tissues, which initiates interspecific competition, sometimes nurturing the herbivorous insects and restraining the gall-inducing insect, particularly when this competition is plant-mediated. Here, to our knowledge, we provide the first evidence of a close relationship between a gall insect, Hartigiola annulipes (Diptera: Cecidomyiidae), and a sap-sucking, Liothrips setinodis (Thysanoptera: Phlaeothripidae). The thrips were observed feeding on young H. annulipes galls, formed on the common beech (Fagus sylvatica) leaves during spring. Among randomly chosen beech trees, 100 current-year shoots were surveyed to determine the number of H. annulipes galls and the presence of thrips on the leaves. Our results show that L. setinodis specimens were found significantly more frequently on leaves infested by the galler than on uninfested leaves. The consequences of feeding thrips at the site of gall formation are not known yet, but it can be supposed that they are unfavourable to the gall insects and therefore could be beneficial for the host plant.

Initial Research on the Influence of the Colour of the Pea Leaves on the Infestation by Thrips

Pobożniak M., Świderski A.

Ecological Chemistry and Engineering. A

2011

Vol. 18, nr 1

83-88

Based on the spectrophotometer analysis and the statistical data processing it was found that the colour of the pea leaves significantly influences the infestation by thrips. The positive correlation was found berween summaty content of chlorophylls in the pea leaves, represented by the absorbance at A. = 680 nm and the average number of thrips. The greater content of the chlorophylls was noticed for the cultivars heavier infested by thrips ('Hazard', 'Walor', 'Jubilat' and 'Maraton') and the lower concentration of chlorophylls was found for the cultivars less infested by thrips.

W wyniku przeprowadzonych analiz spektrofotometrycznych i opracowania statystycznego stwierdzono, że barwa liści grochu ma istotny wpływ na zasiedlenie ich przez wciornastki. Dla badanych odmian stwierdzono pozytywną korelację pomiędzy sumaryczną zawartością chlorofili w liściach grochu, oznaczoną poprzez pomiar absorbancji przy lambda = 680 nm, a średnia liczebnością wciornastków. Odmiany silniej zasiedlane przez wciornastki ('Hazard', 'Walor'. 'Jubilat' i 'Maraton') odznaczały się większa zawartością chlorofili, z kolei mniej licznie zasiedlane odmiany ('Polar' i 'Duet') należały do grupy odmian o mniejszej zawartości chlorofili.