Japanese Knotweed Quiz

Japanese Knotweed Quiz

How much do you know about this highly problematic plant? Take this quizz to see how you do!

published on January 04, 2015
1/7

Which of the two Knotweed plant species can produce a hybrid?

Which of the two Knotweed plant species can produce a hybrid?
Japanese Knotweed and Giant Knotweed
Japanese Knotweed and Himalayan Knotweed
Giant Knotweed and Hybrid Knotweed
2/7

In what year did Japanese Knotweed reach the shores of the UK?

1854
1860
1851
1850
1901
3/7

Which of the 3 Knotweed species is said to be most invasive and problematic to control?

Which of the 3 Knotweed species is said to be most invasive and problematic to control?
Hybrid knotweed (Fallopia japonicus x bohemica)
Japanese knotweed (Fallopia japonica)
Giant knotweed (Fallopia sachalinensis)
4/7

Which Knotweed species can spread by seed?

Which Knotweed species can spread by seed?
Japanese Knotweed
Hybrid Knotweed
Giant Knotweed
5/7

There is growing evidence that Invasive plants like Knotweed species use biochemicals to inhibit the growth of roots in native plants. Any ideas?

6/7

When is the best time to treat Knotweed plants with herbicide?

Hint: 2 choices
After the knotweed has reached its maximum height, from
mid-summer onwards, but before die-back at the first frosts.
March to August
August to March
Optimum time of application is late season (Mid to late September). An early season spray maybe required in year 1 to assist with access for the late season ...
7/7

When a management plan is prepared for the control of Knotweed species near waterways, What is best practice in terms of chemical herbicide choice?

Glyphosate
(360 g/L) where product has an aquatic registration
Triclopyr 240 g/L
picloram, 120 g/L