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, 201520 responses 0 5.0★ / 5

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

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

1854
1860
1851
1850
1901

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)

Which Knotweed species can spread by seed?

Which Knotweed species can spread by seed?
Japanese Knotweed
Hybrid Knotweed
Giant Knotweed

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

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

Select the two correct answers
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 spray.

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