Plant Fitness Assessment for Wild Relatives of Insect Resistant Bt-Crops

Figure 2

Year 2: mean (±1 SE) percent damage per plant per plot 8 weeks after rains on exposed versus protected [tmt] wild mustard and wild radish [species] in disked field, field margin, and natural vegetation plots [hab]. Wild mustard bars, labeled “Mus,” precede wild radish bars, labeled “Rad.” Logistic regression (using 𝑛=30 plot averages of 4 plants) showed significant effects for tmt (𝑑𝑓=1, 𝑋²=52.3, 𝑃=0.0001), hab (𝑑𝑓=2, 𝑋²=6.6, 𝑃=0.0365), and a nearly significant species*hab interaction (𝑑𝑓=2, 𝑋²=5.6, 𝑃=0.0594), but no significant effects for species, or species*tmt, tmt*hab, or species*tmt*hab interactions.