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Ecological Approach to the Identification of the Degree of Phytophage Damage Based on Chlorophyll Fluorescence Induction in Oilseed Radish (Raphanus sativus L. var. oleiformis Pers.)

Tsytsiura Yaroslav

Journal of Ecological Engineering

2024

Vol. 25, nr 2

227--243

The article presented describes a comprehensive study using chlorophyll fluorescence induction (CFI) as a non-destructive method for assessing phytophagous damage, particularly by cruciferous fleas, in oilseed radish (Raphanus sativus l. var. oleiformis Pers.) during early developmental stages. This method has been adapted for ecological monitoring and has implications for building ecological prognostic models. Several key parameters were measured and analyzed in relation to environmental stressors as well as plant damage, according to the basic indicators of the chlorophyll fluorescence induction curve (CFI) in relation to different gradations of cotyledon damage in the interval ‘traces of damage – 70% damage’ for three varieties. Typical CFI curves of cotyledons for different varieties of oilseed rape with different degrees of damage were constructed and its reliability (factor-dispersion and correlation schemes) was evaluated in the practice of indirect identification of adaptive plant response to the stress caused by pest damage with the assessment of the interaction of this damage with environmental parameters of the environment at different levels of stressfulness of the year from the standpoint of hydrothermal moisture regimes. This made it possible to expand the possibility of building ecological prognostic models for assessing the stress response systems of plant development in case of their damage in the early stages of growth processes. A decrease in the basic criteria of the chlorophyll fluorescence curve (F0, Fpl, Fm, Fst) in the range of 20.78–34.56% in the conjugate system damage degree-environmental stress of the period was established. This led to a decrease in the cotyledon water potential (Lwp) in the range of 3.7–41.2%, the plant viability index (RFd) in the range of 8.3–40.1%, and an increase in the indicator of endogenous (stress) factors (Kef) by 6.5–36.4%. On the basis of these studies, the possibility of using the chlorophyll fluorescence method for ecological and entomological analysis of the stress response of plants to the degree of damage to the primary assimilative cotyledonous tissues of plants at different levels of hydrothermal support during their growth period was proven.

Technika oceny i modelowanie statystyczne stopnia uszkodzeń ziemniaka przez stonkę ziemniaczaną

Szwedziak K., Rut J.

Inżynieria Rolnicza

2008

R. 12, nr 6(104)

203-210

W artykule przedstawiono statystyczny model oceny stopnia uszkodzenia liści ziemniaka, na których badano powierzchnię wyżerów spowodowanych przez stonkę ziemniaczaną. W czasie prowadzonych badań zanotowano żerowanie larw stonki oraz żerowanie osobników dorosłych. Za pomocą prostej analizy regresji opracowano zbiór matematycznych wzorów i założeń uzyskując model statystyczny.

The article presents statistic model for the assessment of the degree of potato leaves damage. The analysis covered the area of defects caused by Colorado beetle. Both larvae and imago were feeding on the examined plant during the investigation. Simple regression analysis allowed to develop a set of mathematical formulas and guidelines and to obtain a statistical model.