International Crops Research Institute for the Semi-Arid Tropics, located in Hyderabad, India. This is one of the CGIAR research stations. IITA

The International Institute for Tropical Agriculture, located at Ibadan, Nigeria. This is one of the CGIAR research stations. Ilex paraguariensis

Yerba maté. An infusion of the leaves is similar to tea, which is popular in the southern areas of South America. Immobile nutrients

Immobile nutrients cannot move around in the plant and, consequently, their deficiency symptoms appear first in the young leaves. Immobile nutrients include: Calcium, Boron, Sulphur, Iron, and Copper. Immunity

Immunity means that a host cannot be parasitised by a particular species of parasite. Thus, coffee is immune to wheat rust, and wheat is immune to coffee rust. Immunity is a non-variable. The maximum level of horizontal resistance may be an apparent immunity, but it is not true immunity because it is variable, and it can be eroded. Vertical resistance has often been called immunity, but it too is an apparent immunity because it operates only against non-matching strains of the parasite. Impartial resistance

See: Partial resistance. Imperfect fungus

A fungus that has never been known to produce ascospores, basidiospores, or oospores, and which consequently cannot be classified among the Ascomycetes, Basidiomycetes, or Phycomycetes respectively. The imperfect fungi are also known as fungi imperfecti, the Deuteromycetes, or the asexual fungi, and their reproduction is apparently entirely asexual. Inbred line

A genetic line of plants that has been self-pollinated for a sufficient number of generations (usually a minimum of six) to produce individuals that are more or less homozygous, and which 'breed true'. See also: pure lines. Inbreeder

A species of plant that is autogamous (i.e., self-pollinating). See also: Outbreeder.

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