WSU CAHNRS and WSU Extension

Hortsense

Glossary


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All Glossary

TermDefinition
sanitationthe removal and burning of infected plant parts, decontamination of tools, equipment, hands, etc.
saturatedfull to capacity; in soil – very wet.
sawflynot a fly – a primitive wasp.
scaba roughened, crustlike diseased area on the surface of a plant organ or the common name of a disease in which such areas form.
scorch“burning” of leaf margins as a result of infection or unfavorable environmental conditions.
sepalsone of the units comprising the calyx; a usually green foliaceous element subtending the corolla.
serrations"tooth-like" edge at leaf margin.
sheathsany elongated, more or less tubular structure enveloping an organ or part.
shepherds crookappears like the handle or bent end of a walking cane.
shotholea symptom in which small diseased fragments of leaves fall off and leave small holes in their place or small holes in wood resulting from beetle boring.
silicasilicon dioxide (SiO2)
skeletonizefeeding by certain insects which leads to the elimination of all or most of the leaf tissue – often leaving only the veins.
smuta disease caused by the smut fungi, characterized by masses of dark, powdery spores.
sooty molda sooty coating on foliage and fruit formed by the dark hyphae of fungi that live in the honeydew secreted by insects such as aphids, mealybugs, scales, and whiteflies.
spikelets(1) a secondary spike; (2) one part of a compound inflorescence which of itself is spicate; (3) the floral unit, or ultimate cluster, of a grass inflorescence comprised of flowers and their subtending bracts.
spikes(1) a usually unbranched, elongated, simple, indeterminate inflorescence whose flowers are sessile; the flowers may be congregated or remote; (2) a seemingly simple inflorescence whose "flowers" may actually be composite heads (Liatris).
sporadicirregular events such as insect population outbreaks that are largely unpredictable.
sporescomprised of a single gametophytic cell, it functions as the reproductive unit of fungi and some primitive plants.
stamensthe unit of the androecium and typically comprised of anther and filament, sometimes reduced to only an anther; the pollen-bearing organ of a seed plant.
sterilebarren, not able to produce seed.
stipplingthe appearance of tiny white or yellow green spots on leaves resulting from mite, leafhopper, etc. feeding.
stipulesa basal appendage of a petiole, usually one at each side, often ear-like and sometimes caducous (falls of easily).
stolonsa horizontal stem that roots at its tip and there gives rise to a new plant.
succulentbearing a thickened, juicy, soft, fleshy appearance (e.g., new leaves, or thick-leaved plants like cactus).
symptomsthe external and internal reactions or alterations of a plant as a result of a disease, insect, or mite.
systemicspreading internally throughout the plant.