PCA EXAM DEFOLIANTS (ACTUAL EXAM)
WITH 50+ QUESTIONS AND ANSWERS
LATEST 2024 – 2025 GOOD SCORE IS
GUARANTEED GRADE A+
California Upland varieties - ANSWERS-Include any California
varieties other than Acala. Group is diverse in terms of origin
location, fiber quality, boll size, number of bolls per plant and
other morphological characteristics
Pima varieties - ANSWERS-A different species than upland
cotton. More indeterminant growth habit, more nodes, longer
fruiting branches, smaller bolls and fiber that longer and
stronger than upland varieties. Because of indeterminant
growth Pima is more difficult and costly to defoliate. Longer
growing season than Acala
,Harvest Aid Chemical - ANSWERS-chemicals with various modes
of action that facilitate machine harvest by influencing boll
opening, reducing the ammount of foilage retained on plants at
harvest, speeding tissue dessication, and controlling regrowth
List reason for using harvest aids - ANSWERS--Prepare cotton
for harvest in a more predictable and timely manner
-Help straighten lodged plants for better drying and picking
-Reduce the number of high-moisture-content green leaves,
which otherwise would lower fiber grade
-Can stimulate and enhance boll opening and increase yield and
quality
-can reduce leaf trash and other impurities at harvest and in the
gin
-improve the uniformity of boll opening and maturity required
for mechanical harvested cotton
, -reduce the chances of fiber damage due to high water content
in modules of harvested cotton
-Reduce lint losses associated with excessive need for cleaners
during ginning when cotton has higher trash content
-Promote a more uniform preperation and condition of cotton
that can improve the speed of ginning
-Improve efficency in use of labor and equipment for harvest
-Allow havrest during more favorable conditions
-Reduce the amount of time lint is exposed to late season
insect pests, under certain conditions
-Allow more time to prepare the ground and equipment for the
subsequent crop
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