New Zealand Journal of Ecology (1998) 22(2): 197-203 ©New Zealand Ecological Society possums (Pekelharing and Batcheler, 1990), the palatability of the plant species relative to others in the area (Brockie, 1992; Allen, Fitzgerald and Efford, 1997), the species composition and age structure of the plant population (Payton, 1987, 1988), other environmental stresses (Stewart and Veblen, 1982), pl...

We evaluated the effect of water and ethephon (2-chloroethyl phosphonic acid) under different doses (500 mg·L−1, 1000 mg·L−1,2000 3000 mg·L−1), with without calcium acetate (CA) in two foliar applications on camphor golden shower saplings. It was aimed for to replace pruning reducing transpiration during transplantation. adopted a completely randomized design as an experimental design. An adequ...

Insects defoliate and kill plants in many ecosystems worldwide. The consequences of these natural processes on terrestrial ecology and nutrient cycling are well established, and their potential climatic effects resulting from modified land–atmosphere exchanges of carbon, energy, and water are increasingly being recognized. We developed a Marauding Insect Module (MIM) to quantify, in the Integra...

Spring frosts can defoliate trees, reduce canopy carbon assimilation, and alter interspecific competition dynamics. These events may become more common with climate change, but our understanding of the associated ecological impacts is limited by stochastic nature their occurrences. In 2020, a late spring frost defoliated oak ( Quercus spp.), not co-occurring maples Acer spp.) across temperate b...

George Tamaki and B. A. Butt. Impact of Perillas Bioculatus on the Colorado Potato Beetle and Plant Damage. U.S. Department of Agriculture, Technical Bulletin 1581, 11 pp. 1978 The potential impact of Perillus bioculatus, a pentatomid predator, on the Colorado potato beetle, Leptinotarsa decemlineata, was evaluated by studying the biology, constructing life tables, and determining the feeding p...

Carbon (C) uptake rates in many forests are sustained, or decline only briefly, following disturbances that partially defoliate the canopy. The mechanisms supporting such functional resistance to moderate forest disturbance are largely unknown. We used a large-scale experiment, in which > 6700 Populus (aspen) and Betula (birch) trees were stem-girdled within a 39-ha area, to identify mechanisms...

The Rag1 gene confers antibiotic resistance to soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), and in 2010, varieties expressing Rag1 were released for commercial use in the United States. We do not know how Rag1 varieties will influence the broader community of defoliating insects that inhabit soybean fields. In 2010 and 2011, the preference and performance of pest insects that...

Verticillium dahliae Kleb.is a soilborne pathogen that cause vascular wilt in chrysanthemumplant (Dendranthema grandiflorum (Ramat.) Kitam). The objective of this research was to study the levels of some organic solutes, such as total protein, total soluble sugars, starch and proline, relative water content, RNA level, malondialdehyde and H2O2 contents in leaves of chrysanthemuminoculated with ...

The three keys to whitefly management are sampling, effective chemical use, and avoidance. This study examines factors relevant to the latter two keys in the context of Arizona’s cotton pest spectrum. Insect growth regulators (IGRs) are central to Arizona’s success in whitefly management. The basic usage guidelines developed for the IGRs—initial treatment timing, prescribed intervals between su...

Discoveries in Charles Darwin’s laboratory led to modern herbicides. Darwin discovered the internal mechanism that directed plants grow toward sunlight and sources of water. Scientists Europe America later called this a plant’s hormone response system. Administrators scientists, including Dr. Ezra J. Kraus, Head Botany Department at University Chicago plant physiologist, suggested on eve WWII w...