Word: elme
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...amount of spraying will save the elm trees." Williams commented last month. "The only way of combatting the disease is to cut out the dead wood and cart it away...
ASMALLER number of biologists have also taken exception to the University's spraying program for the Dutch elm disease-a fungus infection imported from Europe. Two species of bark beetle known as Scolytus multistriatus and Hylurgopinus rufipes, inadvertently carry the fungal spores that cause the disease. B and G tries to control the beetles by spraying Harvard's clms in early April before the insects emerge from hibernation...
Later in the summer, a contractor also sprays for the clm leaf beetle, Galerucella xanthomelaena. This beetle does not spread the elm disease itself, but large infestations of these insects may weaken the elms and reduce their resistance to the fungus...
...University has lost some two percent of its elms in the last 10 or 15 years, including five trees last year. Many of these trees were weakened by age and were easy targets for the Dutch elm disease...
Before tree specialists stopped using hard pesticides like DDT to combat the elm disease, insecticide killings of birds were apparently common in Cambridge. Charles F. Walcott, a retired physician and amateur ornithologist, recalls seeing three insect-eating species-the robin, hermit thrush, and flicker-in "typical DDT convulsions" on his property off Sparks Street...