Objective: Taro (Colocasia esculenta L. Schott) is a perennial root crop that belongs to Araceace family.  It is widely cultivated as a staple food in Africa, Asia and pacific Islands. Despite its importance, there is limited information on many aspects of the crop. In order to obtain data that can support improved and sustainable taro production, a field trial was conducted to study t...

Interactions between large herbivores and their food supply are central to the study of population dynamics. We assessed temporal and spatial patterns in meadow plant biomass over a 23-year period for meadow complexes that were spatially linked to three distinct populations of Roosevelt elk (Cervus elaphus roosevelti) in northwestern California. Our objectives were to determine whether the plan...

Objective: An experiment was conducted at Wondo Genet Agricultural Research Center in the production season of 2013/14 and 2014/15 with the objective of identifying the best combination of intra and inter-row spacing for optimum plant population density of stevia. Methods: The experiment was conducted using five intra-row spacing (20cm, 25cm, 30cm, 35cm, and 40...

A machine vision–based corn plant population sensing system was developed to measure early growth stage corn population. Video was acquired from a vehicle–mounted digital video camera at V3 to V4 stages under different daylight conditions. Algorithms were developed to sequence video frames and to segment, singulate, and count corn plants. Vegetation segmentation was accomplished using a truncat...

Identifying to what degree inherent characteristics of plant species and their variation in response environment regulate the temporal stability populations is important understand patterns coexistence ecosystems. Longevity a key characteristic life history an component demographic storage, but age usually unknown for herbaceous species. In 12-year-old biodiversity experiment (Jena Experiment) ...

hyssop (hyssopus officinalis l.), belongs to the family of lamiaceae which its origin is asia minor, and is considered as one of the most important medicinal plant. this experiment was done to study the effects of population and bap concentrations on hyssop plant regeneration under in vitro culture conditions. this research were performed in factorial experiment with three populations (hamadan,...

Although bacterial endosymbioses are common among phloeophagous herbivores, little is known regarding the effects of symbionts on herbivore host selection and population dynamics. We tested the hypothesis that plant selection and reproductive performance by a phloem-feeding herbivore (potato psyllid, Bactericera cockerelli) is mediated by infection of plants with a bacterial endosymbiont. We co...