ABSTRACT Phytophthora nicotianae and P. palmivora infect and cause rot of fibrous roots of susceptible and tolerant citrus rootstocks in Florida orchards. The infection and colonization by the two Phytophthora spp. of a susceptible citrus host, sour orange (Citrus aurantium), and a tolerant host, trifoliate orange (Poncirus trifoliata), were compared using light and electron microscopy. Penetra...

Citrus orchards receive increasing amounts of nitrogen fertilizer for the purpose optimal yields and good quality citrus fruits. Although effects increased on fruit trees have been reasonably well studied, few comparable studies examined impacts soil bacterial communities diversity, even though they play critical roles in orchard ecosystem functioning. In our study, Illumina MiSeq sequencing wa...

Huanglongbing (HLB) is a disease associated with the bacteria "Candidatus Liberibacter spp." and has been devastating citrus orchards around the world. Its management involves control of the insect vector, the Asian citrus psyllid Diaphorina citri Kuwayama. However, the indiscriminate use of chemicals has caused pest outbreaks and eliminated the natural enemies of the vector, such as the parasi...

Nowadays crop mapping as an interdisciplinary hot topic attracted both agriculture and remote sensing researchers' interests. This study proposed automatic method to map citrus orchards in Juybar, Iran, where planting trees is booming there. In this regard, 148 Sentinel-1, Sentinel-2, ALOS Digital Surface Model (DSM) tiles are processed Google Earth Engine provide a hybrid feature set including...

Citrus is one of the most important fruit crops cultivated in South Africa. Internationally, citrus dry root rot a common disease major production areas. Several abiotic and biotic factors are involved development, which Neocosmospora species agents. The diversity associated with symptoms trees Africa was evaluated using morphological molecular analyses. Multi-locus analysis conducted, based on...

In this work, we evaluated the effects of cultivation practices and sites (representing four locations in Crete, Greece) on soil organic carbon sequestration established citrus orchards, olive groves, uncultivated fields (used as a control). Soil pH, texture, matter (SOM), Permanganate Oxidizable Carbon (POXC), Total Kjeldahl Nitrogen (TKN), ratio (C:N), well CO2 respiration rates, specific enz...

Developing efficient sampling protocols is essential to monitor crop pests. One vector of the citrus disease HLB, African psyllid Trioza erytreae Del Guercio, 1918 (Hemiptera: Triozidae), currently threatens lemon industry throughout Mediterranean region. In this work, a pool methods devoted monitoring population T. was compared, its spatial distribution in orchard assessed, and minimum effort ...

Problems of Chinese Citrus Fly (CCF), Bactrocera minax (Enderlein) in citrus orchards have been increasing Nepal. The reason behind the failure CCF control is lack a clear and thorough understanding adult emergence period different altitudes. Therefore, pupae were collected from soil below infested sweet orange trees Sunapati Rural Municipality, Ramechhap, Nepal reared containers height 5 cm di...

Abstract “Huanglongbing” (HLB) is one of the most devastating diseases citrus orchards worldwide. Samples from 183 plants different cultivars and rootstock/cultivar combinations, showing HLB symptoms in three Caribbean countries (Cuba, Jamaica, Guadeloupe-France), were collected to verify possible co-infection ‘ Candidatus Phytoplasma’ Liberibacter’ species. The 64% samples resulted positive Ca...

Ants are one of the most abundant insect groups in citrus orchards. They help controlling pests, but they can also facilitate outbreak other such as those that produce honeydew. Moreover, ants affect natural enemies pests. Here, we review how pest abundance, considering whether produces honeydew and it spends part its life-cycle soil (edaphic stages). We investigated effects presence on with a ...