diff --git a/ApiCore-Frontend/src/app/(app)/colonies/[id]/colony-treatments.tsx b/ApiCore-Frontend/src/app/(app)/colonies/[id]/colony-treatments.tsx
new file mode 100644
index 0000000..1346c25
--- /dev/null
+++ b/ApiCore-Frontend/src/app/(app)/colonies/[id]/colony-treatments.tsx
@@ -0,0 +1,47 @@
+"use client";
+
+import Link from "next/link";
+import { useQuery } from "@tanstack/react-query";
+import { fetchColonyTreatments } from "@/lib/treatments/api";
+import { Button } from "@/components/ui/button";
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+
+export function ColonyTreatmentsCard({ colonyId }: { colonyId: string }) {
+  const { data: treatments, isLoading } = useQuery({
+    queryKey: ["colonies", colonyId, "treatments"],
+    queryFn: () => fetchColonyTreatments(colonyId),
+  });
+
+  return (
+    <Card className="max-w-lg">
+      <CardHeader className="flex flex-row items-center justify-between">
+        <CardTitle>Behandlungen</CardTitle>
+        <Button
+          size="sm"
+          nativeButton={false}
+          render={<Link href={`/treatments/new?colonyId=${colonyId}`} />}
+        >
+          Neue Behandlung
+        </Button>
+      </CardHeader>
+      <CardContent className="flex flex-col gap-3 text-sm">
+        {isLoading ? <p className="text-muted-foreground">Lädt…</p> : null}
+        {!isLoading && (!treatments || treatments.length === 0) ? (
+          <p className="text-muted-foreground">Noch keine Behandlung dokumentiert.</p>
+        ) : null}
+        {treatments?.map((treatment) => (
+          <div key={treatment.id} className="rounded-md border p-3">
+            <p className="font-medium">
+              {new Date(treatment.date).toLocaleDateString("de-DE")} · {treatment.product}
+            </p>
+            <p className="text-muted-foreground">
+              {treatment.amount ?? "—"}
+              {treatment.method ? ` · ${treatment.method}` : ""}
+            </p>
+            {treatment.reason ? <p>Grund: {treatment.reason}</p> : null}
+          </div>
+        ))}
+      </CardContent>
+    </Card>
+  );
+}
diff --git a/ApiCore-Frontend/src/app/(app)/colonies/[id]/page.tsx b/ApiCore-Frontend/src/app/(app)/colonies/[id]/page.tsx
index 7818941..d3a22d7 100644
--- a/ApiCore-Frontend/src/app/(app)/colonies/[id]/page.tsx
+++ b/ApiCore-Frontend/src/app/(app)/colonies/[id]/page.tsx
@@ -8,6 +8,7 @@ import { ColonyActions } from "./colony-actions";
 import { ColonyHistoryCard } from "./colony-history";
 import { ColonyInspectionsCard } from "./colony-inspections";
 import { ColonyVarroaCard } from "./colony-varroa";
+import { ColonyTreatmentsCard } from "./colony-treatments";
 
 export default function ColonyDetailPage() {
   const params = useParams<{ id: string }>();
@@ -33,6 +34,7 @@ export default function ColonyDetailPage() {
       <ColonyActions colony={colony} />
       <ColonyInspectionsCard colonyId={colony.id} />
       <ColonyVarroaCard colonyId={colony.id} />
+      <ColonyTreatmentsCard colonyId={colony.id} />
       <ColonyHistoryCard colonyId={colony.id} />
     </main>
   );
diff --git a/ApiCore-Frontend/src/app/(app)/treatments/new/page.tsx b/ApiCore-Frontend/src/app/(app)/treatments/new/page.tsx
new file mode 100644
index 0000000..6d4d113
--- /dev/null
+++ b/ApiCore-Frontend/src/app/(app)/treatments/new/page.tsx
@@ -0,0 +1,168 @@
+"use client";
+
+import { FormEvent, useState } from "react";
+import { useRouter, useSearchParams } from "next/navigation";
+import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
+import { fetchColonies } from "@/lib/colonies/api";
+import { createTreatment } from "@/lib/treatments/api";
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { Textarea } from "@/components/ui/textarea";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+
+function todayIsoDate(): string {
+  return new Date().toISOString().slice(0, 10);
+}
+
+export default function NewTreatmentPage() {
+  const router = useRouter();
+  const searchParams = useSearchParams();
+  const queryClient = useQueryClient();
+
+  const { data: colonies } = useQuery({
+    queryKey: ["colonies"],
+    queryFn: fetchColonies,
+  });
+  const activeColonies = colonies?.filter((colony) => colony.status === "ACTIVE") ?? [];
+
+  const [colonyId, setColonyId] = useState(searchParams.get("colonyId") ?? "");
+  const [date, setDate] = useState(todayIsoDate());
+  const [product, setProduct] = useState("");
+  const [amount, setAmount] = useState("");
+  const [method, setMethod] = useState("");
+  const [reason, setReason] = useState("");
+  const [notes, setNotes] = useState("");
+  const [error, setError] = useState<string | null>(null);
+
+  const mutation = useMutation({
+    mutationFn: createTreatment,
+    onSuccess: (treatment) => {
+      void queryClient.invalidateQueries({
+        queryKey: ["colonies", treatment.colonyId, "treatments"],
+      });
+      router.push(`/colonies/${treatment.colonyId}`);
+    },
+    onError: () => {
+      setError("Behandlung konnte nicht gespeichert werden.");
+    },
+  });
+
+  function handleSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setError(null);
+    if (!colonyId) {
+      setError("Bitte ein Volk auswählen.");
+      return;
+    }
+    mutation.mutate({
+      colonyId,
+      date: new Date(date).toISOString(),
+      product,
+      amount: amount || undefined,
+      method: method || undefined,
+      reason: reason || undefined,
+      notes: notes || undefined,
+    });
+  }
+
+  return (
+    <main className="p-4 sm:p-6">
+      <Card className="max-w-lg">
+        <CardHeader>
+          <CardTitle>Neue Behandlung</CardTitle>
+        </CardHeader>
+        <CardContent>
+          <form className="flex flex-col gap-5" onSubmit={handleSubmit}>
+            <div className="flex flex-col gap-2">
+              <Label htmlFor="treatment-colony">Volk</Label>
+              <Select value={colonyId} onValueChange={(value) => setColonyId(value ?? "")}>
+                <SelectTrigger id="treatment-colony" className="h-11 w-full">
+                  <SelectValue placeholder="Volk wählen" />
+                </SelectTrigger>
+                <SelectContent>
+                  {activeColonies.map((colony) => (
+                    <SelectItem key={colony.id} value={colony.id}>
+                      {colony.code}
+                    </SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+            </div>
+            <div className="flex flex-col gap-2">
+              <Label htmlFor="treatment-date">Datum</Label>
+              <Input
+                id="treatment-date"
+                type="date"
+                required
+                className="h-11"
+                value={date}
+                onChange={(event) => setDate(event.target.value)}
+              />
+            </div>
+            <div className="flex flex-col gap-2">
+              <Label htmlFor="treatment-product">Mittel</Label>
+              <Input
+                id="treatment-product"
+                required
+                className="h-11"
+                value={product}
+                onChange={(event) => setProduct(event.target.value)}
+              />
+            </div>
+            <div className="flex flex-col gap-2">
+              <Label htmlFor="treatment-amount">Menge</Label>
+              <Input
+                id="treatment-amount"
+                className="h-11"
+                value={amount}
+                onChange={(event) => setAmount(event.target.value)}
+              />
+            </div>
+            <div className="flex flex-col gap-2">
+              <Label htmlFor="treatment-method">Methode</Label>
+              <Input
+                id="treatment-method"
+                className="h-11"
+                value={method}
+                onChange={(event) => setMethod(event.target.value)}
+              />
+            </div>
+            <div className="flex flex-col gap-2">
+              <Label htmlFor="treatment-reason">Grund</Label>
+              <Input
+                id="treatment-reason"
+                className="h-11"
+                value={reason}
+                onChange={(event) => setReason(event.target.value)}
+              />
+            </div>
+            <div className="flex flex-col gap-2">
+              <Label htmlFor="treatment-notes">Notizen</Label>
+              <Textarea
+                id="treatment-notes"
+                value={notes}
+                onChange={(event) => setNotes(event.target.value)}
+              />
+            </div>
+            {error ? (
+              <p role="alert" className="text-sm text-red-600">
+                {error}
+              </p>
+            ) : null}
+            <Button type="submit" className="h-12 text-base" disabled={mutation.isPending}>
+              {mutation.isPending ? "Wird gespeichert…" : "Behandlung speichern"}
+            </Button>
+          </form>
+        </CardContent>
+      </Card>
+    </main>
+  );
+}
diff --git a/ApiCore-Frontend/src/lib/treatments/api.ts b/ApiCore-Frontend/src/lib/treatments/api.ts
new file mode 100644
index 0000000..5201c9c
--- /dev/null
+++ b/ApiCore-Frontend/src/lib/treatments/api.ts
@@ -0,0 +1,13 @@
+import { apiFetch } from "@/lib/auth/api-client";
+import { CreateTreatmentInput, Treatment } from "./types";
+
+export function fetchColonyTreatments(colonyId: string): Promise<Treatment[]> {
+  return apiFetch<Treatment[]>(`/colonies/${colonyId}/treatments`);
+}
+
+export function createTreatment(input: CreateTreatmentInput): Promise<Treatment> {
+  return apiFetch<Treatment>("/treatments", {
+    method: "POST",
+    body: JSON.stringify(input),
+  });
+}
diff --git a/ApiCore-Frontend/src/lib/treatments/types.ts b/ApiCore-Frontend/src/lib/treatments/types.ts
new file mode 100644
index 0000000..f627bf4
--- /dev/null
+++ b/ApiCore-Frontend/src/lib/treatments/types.ts
@@ -0,0 +1,30 @@
+export interface Treatment {
+  id: string;
+  colonyId: string;
+  userId: string;
+  date: string;
+  startDate: string | null;
+  endDate: string | null;
+  product: string;
+  activeIngredient: string | null;
+  amount: string | null;
+  method: string | null;
+  reason: string | null;
+  batchNumber: string | null;
+  notes: string | null;
+  createdAt: string;
+}
+
+export interface CreateTreatmentInput {
+  colonyId: string;
+  date: string;
+  startDate?: string;
+  endDate?: string;
+  product: string;
+  activeIngredient?: string;
+  amount?: string;
+  method?: string;
+  reason?: string;
+  batchNumber?: string;
+  notes?: string;
+}
diff --git a/TASKS.md b/TASKS.md
index 7a063e4..806afb8 100644
--- a/TASKS.md
+++ b/TASKS.md
@@ -75,7 +75,7 @@ Abgeleitet aus [`docs/lastenheft.md`](docs/lastenheft.md) Abschnitt 26. Reihenfo
 - Endpunkte: `GET/POST /api/v1/treatments`, `GET /api/v1/colonies/:id/treatments`
 - Frontend: `/treatments/new`, `/colonies/[id]` Tab "Behandlungen"
 - [x] Backend-Modul fertig, getestet, grün, committet
-- [ ] Frontend-Views fertig, getestet, grün, committet
+- [x] Frontend-Views fertig, getestet, grün, committet
 
 ### 9. Fütterungen