Abstract Purpose To investigate whether soil clay content, cultivar and seasonal variation have any effect on CO 2 emission rates leaf assimilation in a drip-irrigated commercial Citrus sinensis orchard. Methods The study was carried out the field as randomised complete block design × factorial consisting of two types citrus cultivars orchards with 2-week interval measurements gas exchanges for...

In California, pre-emergence herbicide residues have been measured in runoff water from citrus orchards that resulted from winter rainfall. This study measured the effect of rainfall on the redistribution of herbicides within a citrus orchard and the effect that shallow mechanical incorporation had on residue movement. Simulated rainfall treatments were applied to plots within a citrus orchard ...

Glyphosate is the most widely used herbicide for weed control in citrus orchards Brazil; therefore, it likely that several species have gained resistance to this and more than one resistant can be found same orchard. The objective was identify weeds glyphosate from different regions of São Paulo State (SP) determine how many are present within Seeds Amaranthus deflexus, A. hybridus, Bidens pilo...

Few studies have investigated the biometric attributes of citrus orchards under formation that use RGB sensors on board unmanned aerial vehicles (UAV) and challenges are great. This study aimed to develop validate a method using UAV images by automated routines evaluate crop ‘Tahiti’ acid lime formation. We used multirotor UAV, programmed capture at three different map scales, with frontal side...

Objective: Importance of management of gardens weeds is an issue that unfortunately has less been investigated by weeds researchers of country. One of the most important restrictive agents of cultivated surface and producing crops of Citrus orchards are weeds. Methods: To achieve this purpose, a research was performed in plot of Valencia orange trees of citrus fruits of Dezful in 2013. This pro...

Species of Colletotrichum are considered important plant pathogens, saprobes, and endophytes on a wide range of plant hosts. Several species are well-known on citrus, either as agents of pre- or post-harvest infections, such as anthracnose, postbloom fruit drop, tear stain and stem-end rot on fruit, or as wither-tip of twigs. In this study we explored the occurrence, diversity and pathogenicity...

The citrus mealybug, Planococcus citri, is a highly destructive pest of citrus, occurring only in the aerial parts of plants. Humidity will be one of the key factors to consider when using entomopathogenic nematodes (EPN) as biological control agents. Different adjuvants can be added to suspensions of EPNs, to improve control as a foliar application. An aqueous suspension containing Heterorhabd...

High-throughput sequencing (HTS) of citrus indicator hosts, inoculated from psorosis-like diseased samples, revealed the presence first South African variant virus A (CiVA).  This was identified in Italy and is second member Coguvirus genus within order Bunyavirales. The sequence variants CiVA shares 95.55% (RNA1) 94.82% (RNA2) nucleotide identity with Italian sequence. discovery orchards ...