Respostas morfofisiológicas em mudas de coqueiro após desfolha artificial em simulação ao ataque de Opsiphanes invirae (Lepidoptera: Nymphalidae)

Abstract

Coconut farming is represented by Cocos nucifera, has the greatness ofbeing a partner in Brazil, mainly for the North and Northeast regions, generating employment and income for the inhabitants in these regions. However, the culture can be attacked by several species of insects, mainly by Life Loss Virus, Opsiphanes envirae (Lepidoptera: Nymphalidae) and Synale hylaspes (Lepidoptera: Hesperiidae), which cause significant reductions in growth and emission of new islands. to reach the status of "default switch to field". The objective of the study was to evaluate the effects of artificial change through the morphological, biometric and biomass parameters of Cocos nucifera coconut seedlings: 30%, 60% and 90%. The following gas exchange parameters were measured: CO2 net absorption rate (A), stomatal conductance (gs), transpiration rate (E) and intercellular carbon ratio and atmospheric carbon (C7 / Ca), in addition to the variables Growth rate: leaf arca, height, shoot diameter, aerial shoot dry matter, root dry matter, and robustness index of two genetic materiais, Brazilian green dwarf and PB 121 hybrid. The results were compared with the final results of the experiment as PB 121 hybrid seedlings submitted to 30% recovery of biometrics variables such as height and leaf arca, in addition to biomass, showing the coconut seedlings are able to withstand a defoliation of up to 30% without commitment of its development. The Brazilian green dwarf coconut was not able to recover a leaf arca in any of the treatments being, being ali the smaller ones to control the control. The deterioration has hampered the development of cohesion strategies to the detriment of their development.