FERGUSON, J.J. and J.A MENGE. 1982. How and why to add mycorrhizal fungi to plants in the field. Am. Nurseryman 156(6): 67-71.
Soil fumigation is required in some states for producing nursery crops. Methyl bromide, a commonly used fumigant, destroys many soil-borne pests, but concentrations used in most field applications can also destroy indigenous mycorrhizal fungi. Nursery trees that are grown in low-nutrient soil following such fumigation are often stunted. Although many methods have been used to inoculate plants with these mycorrhizal fungi in field and greenhouse trials, few inoculation methods are acceptable for large-scale commercial application. The purposes of this research were (1) to determine the efficacy of various vesicular-arbuscular mycorrhizal formulations and field application methods for both directly seeded and transplanted citrus in fumigated nursery soils, and (2) to evaluate mechanical field inoculation methods.
SCHUDER, D.L. 1982. Insect resistance in woody ornamentals. Plants and the Landscape 5(3): 59-61.
The recognition and utilization of insect resistance in woody ornamentals is still in its infancy, but the potential for its use is unlimited. Resistance in plants may be defined as any factor or group of factors which deter insect attack. The sources of resistance to insects have been classified as (a) non-preference resulting from lack of one or more preferred factors in the host plant, (b) antibiosis or the adverse effect of the plant on the insect, and (c) tolerance of the plant to insect damage. The latter may be the ability to withstand the insect attack or to repair tissues and recover from attack. Selection for insect resistance has been gaining renewed emphasis since biochemical studies have shown that chemical factors in plants are responsible for the feeding habits of insects.
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