Treesearch

Eastern black walnut seedlings were planted on a 1.5 x 1.5m spacing in the spring of 1976 and irrigated throughout the growing season. During the spring of 1977, forage plots consisting of Kentucky 31 tall fescue, orchard grass, or Kobe lespedeza measuring 1 m wide and 10.2 m long and centered on a row of trees, were established with and without irrigation. Soil-water relationships measured throughout the 1977 growing season demonstrated lower on the average in irrigated than in nonirrigated plots during drought periods. Differences were attributed to the greater physiological vigor, thus...

Substantial evidence indicates that drought stress promotes outbreaks of plant-eating (phytophagous) fungi and insects. Observations and experiments show that colonization success and pervalence of such fungi as root and stalk rots, stem cankers, and sometimes wilts and foliar diseases are much higher on water-stressed plants than on normal plants (Schoeneweiss 1986). The evidence associating insects and drought is more circumstantial, consisting largely of observations that outbreaks around the world of such insects as bark beetles and leaf feeders (see Table 1) are typically preceded by...

Woody tissues are produced by each of the approximately 44,000 species of trees, shrubs, and woody vines found worldwide (Hickin, 1975). Most woody tissues are tougher, drier, and nutritionally poorer than leaf tissue when considered as a sustrate for insect growth and development (Slansky and Scriber, 195). Nevertheless, many insects have evolved to live and feed in woody environments; some species inhabit the relatively soft and nutritionally rich inner bark (phloem), whereas others are found in the harder more nutrient-deficient sapwood and heartwood. Other species are xylomycetophagous,...

Discusses recent Indiana forest industry trends; production and receipts of saw logs; and production of pulpwood, veneer logs, and other products in 1984. Reports on logging residue, on wood and bark residue generated at primary wood-using mills, and on disposition of this residue.

Discusses 1985 production and receipts and recent production for other years in the Lake and Central States. Shows Michigan, Minnesota, and Wisconsin production by species for each county and compares production by Forest Survey Unit with that of previous years. Presents 1985 production and receipt data for Illinois, Indiana, Iowa, and Missouri and shows four production classes by county.

Compares growth of 28- to 49-year-old red pine plantations on sandy and fine-textured soils. Red pine growing on these two contrasting soils did not differ in bole form, live crown ratio, or mortality, and tree growth predicted by models (STEMS and REDPINE) developed from trees growing on sandy soils worked equally well for trees growing on fine-textured soils.

White spruce container stock grew better on a sandy loam soil than on a silty clay, and much better without herbaceous competitions. Herbaceous competition was less vigorous on the sandy loam soil following glyphosate treatment, but was more vigorous on the silty clay. Certain spruce genotypes excelled under different field environments.

In 1986 Indiana's forests covered 4.4 million acres, an increase of 12 percent from the 4.0 million acres found in 1967.

The third inventory of the timber resource of Illinois shows a 1% increase in commercial forest area and a 40% gain in growing-stock volume between 1962 and 1985. Presented are highlights and statistics on area, volume, growth, mortality, removals, utilization, and biomass.

This bulletin discusses recent Illinois forest industry trends and contains the results of a detailed study of forest industry, roundwood production, and associated primary mill wood and bark residue in Illinois in 1983.