The New Encyclopædia BritannicaEncyclopædia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 139
A pest defined Economic impact of pests Beginnings of biological control lead arsenate , Paris green , calcium arsenate fluorine compounds. Pest Control When man hunted animals and foraged for food he shared the natural resources with ...
A pest defined Economic impact of pests Beginnings of biological control lead arsenate , Paris green , calcium arsenate fluorine compounds. Pest Control When man hunted animals and foraged for food he shared the natural resources with ...
Page 147
... pests attack a given host plant . If biological methods can deal satisfactorily with perhaps three out of five pest species , two pests will still be free of restraint . In this case , it will be necessary to use a pesticide that could ...
... pests attack a given host plant . If biological methods can deal satisfactorily with perhaps three out of five pest species , two pests will still be free of restraint . In this case , it will be necessary to use a pesticide that could ...
Page 148
Encour- aging natural enemies of pests The dog as the first pet The instructive value of. that pest will continue to be maintained . Integrated pro- grams differ in this respect from programs that attempt to eradicate or to maintain pests ...
Encour- aging natural enemies of pests The dog as the first pet The instructive value of. that pest will continue to be maintained . Integrated pro- grams differ in this respect from programs that attempt to eradicate or to maintain pests ...
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activity America animals appear areas atoms became become body called camera century changes characteristics chemical Church colour common complete compounds consists containing continued drugs early effect electrons elements energy example existence experience Family field Figure fins fishes groups human important increase individual industry Italy known later lens less light liquid living lower major material means ment methods move movement natural North object occur organic original Peking Pentecostal percent period permafrost personality pest Peter petroleum Philip philosophy photographs plants political position possible practice present printing problems production Quakers range region result rocks similar social South species structure surface temperature theory tion United usually widely