Highlights § Soil management is key to avoid soil degradation in areas transformed to irrigation. § Lower stability of aggregates led to soil crusting under conventional tillage. § Long-term no-till enhanced aggregate stability and corn early development. § No-till must be sustained in soils changed to irrigation prone to crust formation.

Està subjecte a una llicència de Reconeixement-NoComercial-SenseObraDerivada 3.

Està subjecte a una llicència de Reconeixement-NoComercial-SenseObraDerivada 3.0 de Creative Commons

Està subjecte a una llicència de Reconeixement-NoComercial-SenseObraDerivada 4.

& Key message Cork oaks highly infested by Cerambyx welensii emit an amount of limonene at dusk, when C. welensii adults become active. In contrast, emissions by neighboring cork oaks free of C. welensii are dominated by pinene-type compounds. & Context The activity of the woodborer Cerambyx welensii Küster is a key factor in the decline of Quercus suber L. dehesas. & Aims This study aimed to estimate whether trees highly infested by C. welensii exhibited a peculiar emission profile, with known antennally active compounds. & Methods Monoterpenes were sampled in situ in 2006 (day/late evening) and 2008 (early evening) from Q. suber stratified by whether or not trees were highly infested by C. welensii and analyzed by gas chromatography. & Results Limonene, α-pinene, β-pinene, sabinene, and myrcene accounted for over 87.2% of overall monoterpene emissions. Monoterpene composition and emission rates differed between the two groups, both during daytime and early evening, with a high presence of limonene in infested trees and dominance of pinene-type compounds in non-infested trees. & Conclusion This work evidenced differences in foliar monoterpene emissions between Q. suber trees highly infested by C. welensii and non-infested trees, with a high presence of limonene in the former and dominance of pinene-type compounds in non-infested trees. We hypothesize that the detection-especially during the onset of insects daily flight-of certain compounds (e.g., limonene), together with the detection of specific ratios of several monoterpenes (e.g., those of limonene to pinenetype compounds), has a role in the intraspecific host selection by C. welensii.