Thursday, 23 April 2015

Mid Semester about PEST



1.     The different between herbivores and pests
Herbivores can said an animal, vertebrate or invertebrate, that feeds on plants. However, as in most aspects of biology, there are some grey areas. These include deciding what is or is not a plant, what are the boundaries between herbivores that mostly feed on live plants and saprovores that feed on dead plants and dead animals and are all pollinators herbivores. Herbivores are often regarded as pests, because they damage plants. In addition there are terms for the host range (number of species) that an organism lives on.
Pest can also defined anthropocentrically means that plant is a human property. The economic value of plant will be the most important factor for determining a herbivore as pest species.
2.      The relationship of the quantitative existance of pests with the yield loss as economis/financial loss is more much the quantitative existance of pests very influence for how much the yield loss (quantitave and qualitative of yield), so it can degress of financial value of yield. So, population of pest has a negative impact for quantitative and qualitative of yield.
            However, if the diversity of pest high, it can make balances of ecosystem. And it is a        advantages for crop, because naturally balance of ecosystem can be formed. However,       it is just at natural ecosystem.  At crop ecosytem, balance condition difficult formed,           because the ecosystem maked by human, so very influence for cultivation, not            naturally formed. Maybe, balance at crop ecosystem can be formed, however it      needs effort to control human for example about how cultivation is doing, about how to prevent/control population of pest.
3.      The first step that should be taken before anyone launching a pest control program is doing identify,
First, Doing field observation
A routine that should be done to ensure what we found inn the field at certain time.
Second, Observation result
Recorded, interpreted, analyzed and used as the basic of decision making
After doing fied observation and observation result can be done a pest control program or measures that can be taken, such as
·         Through culture technque
·         Using resistant variety
·         Usinng mechanical & physical techiques
·         Using biological control agents
·         Using natural measures
·         Using legal measures
·         Using chemical control such as pesticide as LAST CONTROL
4.      Integrated Pest Management should never use pesticides, I don’t agree with the statement, because IPM is the program that combine some methods to control pest include used pesticides. However, used of pesticide at certain time, when the population of pest very much and there’s no others chance to control, so last alternative be used pesticide.
 


No comments:

Post a Comment