The Impulsive Model with Pest Density and Its Change Rate Dependent Feedback Control

Figure 1

Illustration diagrams of the impulsive and phase sets for Cases and . (a) , (b) , (c) . is a trajectory tangent to curve at point , is a trajectory tangent to curve at point , is homoclinic trajectory which touches curve at two points and , and its upper and lower right branches touch curve at points and respectively.

(a)

(b)

(c)