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Yellow dwarf

A viral disease transmitted by green leafhoppers (Nephotettix sp.). The first symptom of yellow dwarf is general chlorosis, especially on the newly emerged and young leaves. The color varies from yellowish to green. As the disease progresses, the infected plants become severely stunted, tillering increases markedly, and leaves become soft and droopy. The infected plants produce either no panicles or a few small panicles, which bear mostly unfilled spikelets.   

Yellow leaf

Seedlings which have pale yellow leaves, but this condition is non-lethal.

Yellow mottle

A disease caused by rice yellow mottle virus. The virus disease can be transmitted by mechanical inoculation or vectored by the adult beetle Sesselia pusilla. It is characterized by stunting and reduced tillering of the infected rice plant; crinkling, mottling, and yellowish streaking of the leaves; malformation and partial emergence of the panicles and sterility.   

Yellow revolution

The growth, development and adoption of new varieties of oilseeds and complementary technologies nearly doubled oilseeds production from 12.6 mt in 1987-88 to 24.4 mt in 1996-97, catalyzed by the Technology Mission on Oilseeds, brought about the Yellow Revolution.

Yellow stem borer

The borer which attacks rice throughout its growth period. It lays its eggs near the tip of the leaf blade in oval masses of 50-200 eggs each, which hatch in 8 days. The larva is cream-colored and the head capsule is reddish brown. The pupa is yellowish white with a tinge of green, but turns dark brown just before emergence. The male moth is light brown with numerous small brownish dots along the subterminal area and near the tip of the forewing. The female adult is yellow, the color deepening toward the tip, and there is a very distinct black spot in the center of each forewing. The hindwings are pale and straw-colored. Scientific name is Scirpophaga incertulas.

Yellowing

1) A condition where the leaves of plants turn yellow, caused by lack of light. 2) A sign of disease or of nutrient deficiency.

Yellowness

A general term for any plant disease in which the leaves become yellow.

Yield

The quantity of a crop or a product produced from a plant or from an area of land. The amount of a specified substance produced.

Yield components

The factors that contribute to grain yield - number of panicles per square meter, spikelets per panicle, percentage of fertile spikelets, and weight of each single grain.

Yield diminishing

A decrease in grain yields over a period of at least several years.

Yield gap

The yield gap is the difference between the maximum attainable yield and the farmlevel yield, which are defined in the following ways: Maximum attainable yield: the rice yield of experimental/on-farm plots with no physical, biological or economic constraints and with the best-known management practices for a given time and in a given ecology. Farm-level yield: the average farmer’s yield in a given target area at a given time and in a given ecology.

Yield growth rate decline

A slowdown in the (percentage) rate of increase of grain yield over time.

Yield potential

The maximum grain yield of a given variety in a given environment without constraints involving water, nutrients, competition, pests, diseases, or climatic conditions.

Yield stability

A continual annual or periodic yield of plants or plant material from a given area. This implies that the management practices are such, that they will maintain the productive capacity of the land.

Yield trials

Trials in which the main objective is to determine and compare the yields of a cultivar against a check.

Yielding ability

The expected capacity of the plant to produce a certain quantity of grain.

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