Weed Science

Front 1

what is weed

Back 1

weed is plant out of place or plant growing where they are not needed

Front 2

what problem does the definition of weeds carry?

Back 2

it does not take into account the problem caused by the weeds n the characteristics contributing to thier potential as weeds

Front 3

Give other definition of weeds

Back 3

1.plant that interfere the objective or activities or welfare of man

2.plant that interfere utilisation of land or water resources

3. poisonous plant to livesstock( I.e those that affect the quality and quantity of animal product.

Front 4

describe weeds?

Back 4

1. they special form of vegetation

2. they are thought to be pioneers in secondary succession

3.250 plant spp r discovered as weed of which 75 r responsible for 90% of crop losses

4. weeds are introduced from distant geographical area through both natural and human agencies

Front 5

what is weed science

Back 5

The study of biology of weeds and effect on productivity ,method of controlling and managing weeds and the consequence of controlling measures on both environment and man

Front 6

why does Agronomic study of crop not complete without studying adequate knowledge of weed science

Back 6

due to the impact of weeds on crop production and consequence of weed control measures

Front 7

what field of knowledge is involved in studying weed science

Back 7

Taxonomy, morphology ,soil genesis, soil chemistry , soil physics, genic n physiology

Front 8

what factors influency incoperation into weeds flora

Back 8

pre adaptation

Evolution

alien migration

Front 9

why does evolved weeds ocured?

Back 9

occurred due to

1.speciation

2. crop mimicry

3.Race formation

4.Herbicide resistance

Front 10

what is microcarpum

Back 10

perennial and slow to flower n less plastic

Front 11

what causes crop mimicry

Back 11

co-evolution of crop m weeds under same hand

Front 12

what is the effect of crop mimicry

Back 12

functionally imitate the model so that operator (man) is unable to discriminate between model n mimic

Front 13

how does mimic increased ?

Back 13

gene exchange fTom crop to weed

Front 14

........ is potent source of propagule of alien plant?

Back 14

importation of seeds and commodity

Front 15

why do few alien spp succeed in establishing themselves as damaging weeds

Back 15

climate, presence of predator, genotype, small population at time of introduction

Front 16

what is weed ecology?

Back 16

it's the study of growth characteristics and adaption that enable us to eploit the niche left open in the environment altered by man for his use and ,the survival mechanism which makes weed survive in environment