Spurge

These plants are characterized by a well-developed root system, often taproot or root-sprouting, which makes them difficult-to-eradicate weeds. In most species, the leaves are entire, sessile or petiolate, and arranged alternately.

Spurge flowers are very small and gathered into specific inflorescences called cyathia, which may externally resemble a single flower. The fruits are three-lobed capsules that can forcefully eject seeds over significant distances upon maturity.

Biologically, weedy spurges are distinguished by high adaptability to various soil types and drought tolerance. The toxicity of the milky latex provides the plants with protection against most phytophages, giving them an advantage in natural competition.

In field conditions, spurges are easily recognized by the specific appearance of their inflorescences and the abundant release of milky latex upon mechanical damage to the aerial parts.

Weedy species of spurge are found everywhere in crops of cereals, row crops, and industrial crops, as well as on fallow land, pastures, and uncultivated areas. They are capable of infesting both moist sites and dry steppe zones.

The most aggressive are perennial species, which rapidly colonize territories through vegetative reproduction via rhizomes. Annual forms are more likely to dominate on loose, well-warmed soils.

Most often, spurge is found on roadsides, in orchard rows, and in fields with poor soil cultivation practices. High population density is often observed on plots with insufficient crop maintenance.

Seed dispersal occurs via wind, water, and along with crop seeds, as their size often matches that of the grain. Some species are capable of germinating at minimal temperatures in early spring.

Typical habitats span almost all agricultural zones, from forest-steppes to arid semi-deserts, where the weed exhibits exceptional resilience.

The primary damage caused by spurge lies in its intense competition with crops for water, nutrients, and sunlight. Due to its developed root system, spurge depletes the soil moisture layer to a depth of up to one and a half meters.

The milky latex exuded by the plants contains alkaloids and other bioactive compounds that can exert an allelopathic effect on the germination and development of agricultural crops.

The presence of spurge in pastures poses a direct threat to livestock. Ingestion of plant parts in hay or green forage causes severe poisoning in cattle and sheep.

Infestation of crops with spurge significantly hinders harvesting operations by clogging combine harvester mechanisms and increasing the moisture content of the harvested bulk due to the succulent stems of the weed.

Ultimately, a high level of spurge infestation leads to a significant decrease in crop yields (up to 30% or more) and a loss of marketability of the harvested produce.

Effective control of spurge requires a comprehensive approach that combines agrotechnical and chemical methods of control. The basis of agronomic management is deep plowing and timely root cutting during the period of their exhaustion.

• Deep autumn plowing to trigger seed germination.
• Systematic cultivation in the black fallow system.
• Crop rotation involving competitive cover crops.
• Usage of high-quality seed material without impurities.

The chemical method involves the use of systemic herbicides capable of penetrating the deep-seated roots of perennial forms. Glyphosate-based products are most effective when applied to fields in the post-harvest period.

In growing crops, the use of selective herbicides (specifically those with hormonal activity) is recommended to suppress spurge development without damaging the primary crop.

An important element is preventing the weed from setting seed. Mowing on uncultivated plots and along field roads helps to reduce the soil seed bank in the long term.