We examined effects of a first nitrogen (N) fertilizer application on upper-canopy needle morphology and gas exchange in approximately 20-m-tall loblolly pine (Pinus taeda L.) exposed to elevated carbon dioxide concentration ([CO(2)]) for 9 years. Duke Forest free-air CO(2) enrichment (FACE) plots were split and half of each ring fertilized with 112 kg ha(-1) elemental N applied in two applicat...

The midgut pH of gypsy moth (Lymantria dispar) larvae was significantly lower when larvae were fed acidic foliage. At 30 min after the start of a feeding bout, larvae feeding on bigtooth aspen (foliage pH = 6.04) had average midgut pH levels of 10.16, while larvae feeding on red oak foliage (foliage pH = 3.84) had average midgut pH levels of 9.36. Midgut pH was also significantly reduced when l...

Abstract To investigate the in vitro anthelmintic efficacy of dividivi (Caesalpinia coriaria), a traditional medicinal plant used Central America and northern part South America, extracts from foliage this were subjected to egg hatching test (EHT) larval exsheathment inhibition (LEIT), against Haemonchus contortus. Four different evaluated: acetone-water (AW), methanol-water (MW), acetone-water...

Leaf N signature is a powerful tool that can provide an integrated assessment of the nitrogen (N) cycle and whether it is influenced by rising atmospheric CO2 concentration. We tested the hypothesis that elevated CO2 significantly changes foliage d N in a wide range of plant species and ecosystem types. This objective was achieved by determining the dN of foliage of 27 field-grown plant species...

The turbid medium approaches (e.g. Sinoquet et. al., 2001) consider the transmission of light through a continuous medium. To model the spatial heterogeneousness of the foliage the canopy is divided into volume elements and the properties of the foliage contained in a volume element is described in an aggregated manner. The volume element can be for example a horizontal layer of foliage or a cu...

In Mexico, phymatotrichopsis root rot is regarded as the most important disease in pecan tree. Its causative agent fungus Phymatotrichopsis omnivora (Duggar) Hennebert, and percentage of diseased trees ranges between 3 to more than 25% a plantation. Symptoms vary from mild damages death infected The roots invaded by die with consequent reduction foliage. Chemical control one used methods this p...

Greenhouse studies were conducted to determine the effect of harvesting sweetpotato [Ipomoea batatas L. (Lam.)] foliage tips (terminal 15 cm) on storage root yield, edible biomass index (EBI), and linear growth rate. Plants were grown hydroponically from 15-cm vine cuttings planted in 0.15 × 0.15 × 1.2-m growth channels using a recirculating nutrient film technique system. Nutrients were suppli...

Branches of nine-year-old loblolly pine trees grown in a 2 x 2 factorial combination of fertilization and irrigation were exposed for 11 months to ambient, ambient + 175, or ambient + 350 micro mol mol(-1) CO(2). Rates of light-saturated net photosynthesis (A(max)), maximum stomatal conductance to water vapor (g(max)), and foliar nitrogen concentration (% dry mass) were assessed monthly from Ap...

Significant Findings: 1. Apple leaf quality deteriorates with the season. We confirmed in multiple seasons that L. subjuncta larval development is prolonged and pupal weight is decreased on apple foliage as the season progresses. These data indicate the apple leaves are a relatively good food material for Lacanobia larvae early in the season but deteriorate in quality later in the season. Simil...