Ecology Lesson 19 Issues With Pesticides

Ecology Lesson 19 Issues With Pesticides

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Overview Benefits of Pesticide

Reduce _______ damage, increase production, ____________

growth rate Control population of ______________ insects and limit the

spread of ______________ Application of Pesticide

Dispersed through ______________ or ______________

onto fields, forests and gardens Pesticide may not reach target because it is carried away

by _______ or lands on _______ Become source of air, water

_____________________



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Pesticide may reach _______-______________ species

A) Non-Target Species Pesticides often kill species they were not intended to kill

Often seen in ______________ _____________________ pesticides May kill _______-______________ or even _____________________ organisms that

______________ on pests Makes farmers depend more on pesticides because ______________ pest controls are

removed Ex. 1955 _______ spraying in Borneo

Originally used to control ______________ causing _____________________ Also killed ______________ that prey on ______________ eating caterpillars

The caterpillars then damaged the ______________ huts of villagers Also killed _____________________ that were consumed by ______________

DDT damaged lizard ______________ system, making them prey for _______ The cats died from eating the poisoned lizards The _______ population flourished, and the _______ on rats spread the

______________ _____________________ cats had to be brought in to control the rats

B) Bioaccumulation Pesticides can _____________________ in _____________________ organisms

Some pesticides are not broken down or _____________________ with body waste Only ______________ _____________________ chemicals can be eliminated Many pesticides are _______ _____________________

Pesticides levels in individuals may become ___________ than in the environment

C) Bioamplification Toxins stored in _______ and _______ of organisms at one ______________

______________ are passed on to organisms at the next ______________ ______________ Pesticides become more _____________________ higher up in the food chain Pesticides may become bioamplified until they're ______________

Ecology Lesson 19 Issues With Pesticides

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_______ concentrations in birds caused egg shells to become too ______________ Seen in the ______________ because there are a lot of long lived _______

__________________ D) Bioamplification (continued)

By ?ystein Paulsen - , CC BY-SA 3.0,

D) Pesticide Resistance

Ecology Lesson 19 Issues With Pesticides

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Occurs when the pesticide is no longer able to ______________ the pest

Individuals with resistance will _____________________ and _______ ____ that resistance

Likely to develop in ______________ and ______________ because they _____________________ so _____________________

______________ pesticide or a _____________________ pesticide is needed when pests become resistant

By Self - Own work, CC BY-SA 3.0,

E) Reducing Pesticide Dependance Organic Farming

No _____________________ pesticides or fertilizer Sometimes accept crop ______________, which are offset by higher product

______________ and _____________________ from not buying fertilizer Alternatives to pesticide

Method biological control

Description _____________________ species prey on and infect pests Ex. Predatory ______________, ______________, disease

causing _____________________

altered timing

Planting and harvesting crops at times that avoid ___________ ___________ _____________________

crop rotation and mixed planting

Not growing monoculture in ______________ location every year

Prevents pest populations from becoming _____________________

baiting pest

_____________________ baits used to confuse

______________ insects

Integrated Pest Management Uses _______ pest management methods Use ______________ techniques along with _____________________

_____________________ and _____________________ when neccessary Keeps ______________ low, maximizes ______________, reduces

_____________________ harm

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